HI - That's easy to do. Go to settings then Screen/KeyboardScroll down to the key settings and click on the to change to whatever you like. Have fun - Mitch
Psymls is right, go to the convenience key section in 'screen and keyboard' within options. But, on the AT&T ones, when you change the 'Push-To-Talk' key, you sometimes have to do a battery pull so it 'keeps' the setting...