Really lost on installing Mavericks...any help?

Sorry, I don't understand any of this. I am a real novice, started on a Macintosh with Quark doing graphics at work but when it comes to technical stuff I know nothing. I have no idea what you are saying. All I know is I have 2 partitions on my desktop, one says Snow Leopard and one says Lion. When I go back and forth they both say startup disk is Snow Leopard. I just want to put Mavericks on the Lion partition to try it to see what works, which means I need Quark to stay on there if possible - it is a major issue I had when trying to install that on 2 partitions I remember from before. I did an install of Mavericks on it last week, but as I said above it seemed to have changed both partitions at first, now it is nowhere and I just need someone to tell me exactly what I need to do just to install that on the Lion partition. But since it says startup disk Snow Leopard while under the Lion partition I have no idea if I am doing something wrong or what is going on. Anyone help with basic instructions on exactly what I need to do?

Does this help any? When I go into Disk Utility and select Lion it says below - looks like it has 10.9.3??? If it does, why when I select Get Info when restarting into that partition it says 10.8.6 and startup Disk Snow Leopard???

Name : Lion

Type : Volume

Disk Identifier : disk0s2

Mount Point : /Volumes/Lion

System Name : Mac OS X

System Version : 10.9.3

System Build : 13D65

File System : Mac OS Extended (Journaled)

Connection Bus : SATA

Device Tree : IODeviceTree:/PCI0@0/SATA@B/PRT0@0/PMP@0

Writable : Yes

Universal Unique Identifier : 2D43B3DA-6D8B-3261-9EE7-E6BFE611CA90

Capacity : 248.9 GB (248,898,408,448 Bytes)

Free Space : 194.13 GB (194,134,405,120 Bytes)

Used : 54.76 GB (54,764,003,328 Bytes)

Number of Files : 617,096

Number of Folders : 151,032

Owners Enabled : Yes

Can Turn Owners Off : Yes

Can Repair Permissions : Yes

Can Be Verified : Yes

Can Be Repaired : Yes

Can Be Formatted : Yes

Bootable : Yes

Supports Journaling : Yes

Journaled : Yes

Disk Number : 0

Partition Number : 2

OK, this helped me immensely. When I go to System Preferences / Startup Disc it shows Mac OS X, 10.6.8 on Snow Leopard; Mac OS X, 10.9.3 on Lion; Network Startup. I then clicked on the 10.9.3 Lion and it restarted and under About this Mac it shows 10.9.3 Lion startup disc - yea! OK, so do you always have to go to system preferences/startup disk to go into the other partition? I was doing a restart, then just selecting the 2nd partition that showed up and when I do that it shows 10.6.8 Snow Leopard. So to be sure I must go into system preferences and choose the startup disk there, right? How can I rename that startup disk Maverick so it isn't so confusing? Now that I know if I must go thru system pref's to do this, I would like to play in Mavericks for a while to get to know it and see what it is like and become familiar. It doesn't have the disks on my desktop like Snow Leopard does so have to find everything and want to see what works and what doesn't for me. If at that stage I find I want to update Snow Leopard, can I just install that over the Snow Leopard without reformatting or anything so I keep all my mail, pictures, documents and the few applications I do have (mainly Quark)? Wow, thanks so much for helping me find Mavericks, now just need to rename it. Also, Snow Leopard is listed under my name of Gary Schnetter and Lion (Mavericks) is listed under gsnicker - I would like to rename those something easier to define what drive is what...any help doing that is also appreciated! Thanks so much for the help to this point!!!!!

Thanks. I feel dumb...too easy...sorry. I've been playing in Mavericks and most everything seems to be working OK. I guess I have to do the system preferences to change partitions per my questions in last email. I did have problems playing facebook games and pogo, but downloaded new java and now that seems to be working also. Now I just have to figure out how to do this on my Snow Leopard drive so I can keep all my bookmarks, mail files, pictures, apps on that drive. Any help on that is appreciated. I'm not too tech savy as you can tell and simple instructions in layman's terms are so appreciated.Thanks so much all!

Actually, now having some issues in Mavericks. I can do almost everything, except when I go into Facebook I can no loner play the games. I got in there once and they worked, but no longer load. They get about 3/4's loaded and then just set there. Have to do some preferences cleaning and maybe repair disk and see if that allows this.

Actually, I have Mavericks on the (not sure what SL is) 2nd partition on my disk. My first partition is still Snow Leopard where I have everything now like my mail, pictures, i-tunes library, bookmarks, etc. Once I figure out that I can play Facebook games, I then want to install Mavericks over the Snow Leopard partition but I want to make sure I retain all my emails, bookmarks, i-tunes library, pictures, etc., I have there now. Everyone seems to tell me I need to do a clean install of Mavericks first, but can I just install Mavericks over the top of this so I don't have to change anything on Snow Leopard first and it will switch to Mavericks with all my app's, emails, etc., left in place? Thanks.

Or once I figure out facebook games, am I better off just trying to transfer bookmarks, mail, etc., from Snow Leopard to Maverick instead of installing it over the Snow Leopard partition? Also, any idea where I can remove a desktop picture in Maverick. I removed it in my Library in Snow Leopard but did find something about the option key and finding library, but still no Desktop Pictures file...