From the Home screen, tap the Menu Key > System settings > General tab > Guest mode.
Tap Set pattern, then set the pattern you want to use to put your phone in Guest mode.
Tap Set apps to view which apps can be accessed in Guest mode. Tap the Add icon (in the upper-right corner of the screen) to change the Guest apps list.
Checkmark the apps that can be accessed.
Remove checkmarks from the apps that you don't want to be accessed.
Tap OK when all of the checkboxes are set as you want.
Tap the Back Key to return to the Guest mode settings, then tap the Guest mode switch (in the upper-right corner of the screen) to turn it on.
If your Lock screen is not set to Pattern, tap OK, then tap Pattern and enter your normal unlock pattern as necessary.
If your unlock sequence is set to a PIN or password, you'll need to enter it to be able set the unlock pattern.