Currently Being ModeratedDec 8, 2012 10:16 PM (in response to elaphe2)
You set this in in the "General" settings: Autolock
From the User Guide:
Set the amount of time before iPad locks: Go to Settings > General > Auto-Lock, then choose a time.
To switch between screens use the Navigation Buttons in the Control Bar, see the manual
The "My Songs" button saves the current song and opens the My Songs browser.