Signed in and someone elses' name by Welcome -- not me! Pls help!

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Please read your other post: How to get rid of "canvas fingerprinting" pop-up?

Because then suddenly it changed to someone elses name....I took a picture with my phone, the picture shows the users name and an iCloud email address. I am a little freaked out. I've never heard of this person and I've never had an iCloud email address!

The reason for that is that you purchased your Mac used, and the seller did not erase and reconfigure it prior to transferring ownership. That task has now fallen to you. You will encounter continual problems until you do that.

To correctly sell or transfer ownership of a Mac, even to someone in your family, you should follow these instructions.

Disregard anything you are unable to accomplish.

Refer to What to do before selling or giving away your Mac

1. If you enabled FileVault, disable it in System Preferences > Security & Privacy.
2. "Deauthorize" your iTunes account. Same for Audible if you have one.
3. System Preferences > iCloud > de-select "Back to My Mac" and "Find my Mac".
4. Sign out of iCloud. Select "Delete from Mac" when it appears.

Next: Remove all your personal information by completely erasing the Mac's internal storage.

1. If your Mac shipped with a grey System Install DVD, start your Mac with that disc inserted in the optical drive while holding the c key to boot from it instead of its internal volume, which should be erased before selling it.

   Apple stopped shipping Macs requiring those discs in August, 2011.

2. If your Mac did not ship with discs, boot OS X Internet Recovery:
   • using three fingers press and hold the following keys: ⌘(command), option, and R.
   • With a fourth finger press the power button to turn on the Mac.
   • Keep the other three fingers where they are until you see the "spinning globe" icon.
   • This method forces the Mac to download its originally installed OS from Apple's servers, which will not require an Apple ID to install.
3. Remove any Open Firmware password if you created one: select Firmware Password Utility from the Utilities menu and remove it.
4. Select Disk Utility from the Utilities menu.
5. Remove any partitions you may have created.
6. Select the Mac's hard disk icon, then select the "Erase" tab.
7. Select the "Security Options" button and erase the disk.
   • The more "securely" you erase the disk, the longer it will take.
   • The fastest method is sufficient since all but the most expensive techniques and equipment will be able to recover securely erased data.
8. When it finishes, quit Disk Utility.
9. Select Install Mac OS X from the Utilities menu.
   • An Apple ID will not be required. If a prompt for an Apple ID appears, return to Step 5.
   • Do not create any user accounts.
10. When it finishes, shut down the computer.
11. If you want to install the bundled apps that were included with your Mac, restart by using your Applications DVD if one was included, and install the bundled apps.

    Apps bundled with newer Macs that shipped without discs cannot be transferred. Its new owner must purchase them from the Mac App Store using his or her own Apple ID.

If the Mac is being sold to someone outside the family consider the following additional information:

1. System Install DVDs that came with your Mac should remain with it forever, and must be included with the sale.
2. Consider including your AppleCare certificate if you bought it, printed documentation, even the box if you still have it.

   AppleCare stays with the equipment and is transferable.

3. Execute a bill of sale showing the Mac's serial number.
4. Once no longer in your possession, remove the Mac from your devices in My Support Profile.

This is what should concern you, the bold face in particular:

Because then suddenly it changed to someone elses name....I took a picture with my phone, the picture shows the users name and an iCloud email address. I am a little freaked out. I've never heard of this person and I've never had an iCloud email address!

That should never occur, and is what leads me to believe that Mac was improperly configured prior to purchasing it. Another possibility is that someone you never heard of gained access to it and created an account for it, in which case you have good reason to be freaked out. My recommendation to erase it completely remains unchanged, due to that concern.

Can you think of anyone who might have had your Mac, for even a brief period of time? Do you use a reasonably secure login password – something only you can know and isn't easily guessed? Are the wireless networks you use protected with a secure wireless password, and is your network infrastructure physically inaccessible to anyone untrustworthy? Those questions become important in situations such as this.

Are the wireless networks you use protected with a secure wireless password, and is your network infrastructure physically inaccessible to anyone untrustworthy?

wep encryption on a wireless router doesn't count.

"The current standard is WPA2;"

https://en.wikipedia.org/wiki/Wireless_security

OhThatGirl wrote:

I Do have our router password protected but think it's time for changing all passwords and revisiting all settings.

I agree.