How do I switch users or log off from Windows 8? It's not under the shut down menu

It turns out that in Windows 8, the user switching and logout functionality has been moved to the top of the start screen. It's hard to tell that it's actually a menu button, but if you click your username on the start screen, a drop-down box will appear with options to log out, lock the screen, change your account picture, or choose a user to switch to.

You can also add shutdown, restart, log off, switch user to the desktop right click(context menu) menu. Just download this registry file and run the add-menu.reg file and it immediate add the menu to the right click menu. If you don't like it to keep their then simply run the remove-menu.reg file and it will gone form there.

Information from this source.

See here for lots of ways:
http://www.eightforums.com/tutorials/2584-lock-log-off-restart-shut-down-switch-user-windows-8-a.html

While in the Start screen, click/tap on either your user name or picture tile to select the Lock, Sign out (Log off), or switch user option.

Press the CTRL+ALT+DEL keys. From here you can select to Lock this PC, Switch user, Sign out (Log off), or you could click/tap on the power button at the bottom right corner to select to Sleep, Hibernate, Shut down or Restart Windows 8.

While on the Desktop (Windows+D), press the ALT+F4 keys. From here, you can select to Switch user, Sign out (Log off), Sleep, Hibernate, Shut down, or Restart Windows 8.

1. Open the Charms Bar in Windows 8, and click/tap on Settings.
2. Click/tap on the Power button at the bottom right corner in the Settings slide out menu. From here, you can select to Sleep, Hibernate, Shut down or Restart Windows 8.

Click/tap on the Power button at the bottom right corner in the Settings slide out menu. From here, you can select to Sleep, Hibernate, Shut down or Restart Windows 8.

1. Open Task Manager, and click/tap on More details.
2. Click/tap on the Users tab. From here, you can select a signed in user to Sign out or Switch user. (see screenshot below)

open run tiype "shutdown -s -t 0" press enter for shutdown tiype "shutdown -r -t 0" for restart tiype "logoff" for logoff tiype "rundll32.exe powrprof.dll,SetSuspendState" for sleep tiype "rundll32.exe User32.dll,LockWorkStation" for Lock Screen