how do you logoff your screen name

my sister wants to get on but we cant find any way to logoff or cahnge a screen name...HELP!

You have 2 options. first one is to go to the main page, scroll right down to the bottom of page and logout.

Or do what I do, go to post something and instead of posting I logout next to my sign in name. That's located at the top of your screen. If you have logged out and it doesn't let you log out, close the window and then re-open it. Works for me everytime.

love UT