How to manually apply "Apple Broadband Tuner" tweaks to Mavericks?

My system:

1-yr old

Mac Mini

Mavericks

OS X 10.9.1 (13B42)

2.6 GHz Intel Core i7

16 GB 1600 MHz DDR3

I did a Verizon speed test while online, in "MyVerizon". I'm in New York City, Manhattan. DSL service. FiOS not available.

Link to their speedtest: http://my.verizon.com/services/speedtest/

Results: 8.96MB down, 0.75MB up.

"Speed Test is complete, here are the recommendations:

Your computer settings may be slowing you down, select Apple Broadband Tuner to reconfigure your settings and maximize your speeds."

The link takes you to: http://support.apple.com/downloads/Broadband_Tuner_1_0

I downloaded it, and tried to install it. Message: "BroadbandTuner.mpkg" can't be opened because it is from an unidentified developer."

"...unidentified developer"?

Its from an Apple site!

Anyway, I did a little searching and found this post.

I would like to apply the fix "baltwo" detailed, but I'm not at all Mac-terminal-programming savvy.

I got to terminal, logged in and got to this screen:

# Tuning network for broadband

#

# START

kern.ipc.maxsockbuf=512000

net.inet.tcp.sendspace=131072

net.inet.tcp.recvspace=358400

# END

[ Read 8 lines ]

^G Get Help ^O WriteOut ^R Read File ^Y Prev Page ^K Cut Text ^C Cur Pos

^X Exit ^J Justify ^W Where Is ^V Next Page ^U UnCut Text^T To Spell

So what I don't understand is where and how to ...

"Add the following lines:

kern.ipc.maxsockbuf=800000
net.inet.tcp.sendspace=400000
net.inet.tcp.recvspace=400000
net.inet.tcp.delayed_ack=0
net.inet.udp.recvspace=131072

Then type CONTROL o - it will ask to save, press return key.

Then type CONTROL x
Restart the computer and Shazam!"

I'm much more comfortable working with pc's, using a command window and entering commands. Even though my first computer was the original 1984 Mac, and still like Mac's, for my business back in the 1980's, I had to go pc, and my learning curve is stuck there. The Mac Terminal interface and commands are totally foreign to me, so if someone could "hold my hand" and walk me through how to make the changes, I'd be much obliged!

And I'm really talking about telling me, keystroke-by-mouse-click, how to do this!

And ... I'm not using a mouse keyboard ... I'm using a pc keyboard so please let me know the right keys to press!

Many thanks and Happy Holidays!