Only the mail screen is frozen so I cannot send/receive/compose mail

iPad Frozen? How to Force Quit an App, Reset or Restart Your iPad

http://ipadacademy.com/2010/11/ipad-frozen-how-to-force-quit-an-app-reset-or-res tart-your-ipad

iPad: Basic troubleshooting

http://support.apple.com/kb/TS3274

 Cheers, Tom 😉

Quit mail like this,

Go to the Home screen and double click the Home button. That will reveal the row of recently used apps at the bottom of the screen. Tap and hold on the app in question until it wiggles and displays a minus sign. Tap the minus sign to actually quit the app. Then tap anywhere on the screen above that bottom row to return the screen to normal. Then restart the app and see if it works normally.

WWhere is the Home button

It's the round button with the square on the face of your iPad.