how do you send mail?

Read page 45 of the iPad Manual:

iPad and iPad mini User Guide (For iOS 6 Software)

iOS: Unable to send or receive email

http://support.apple.com/kb/TS3899

Can’t Send Emails on iPad – Troubleshooting Steps

http://ipadhelp.com/ipad-help/ipad-cant-send-emails-troubleshooting-steps/

Setting up and troubleshooting Mail

http://www.apple.com/support/ipad/assistant/mail/

iPad Mail

http://www.apple.com/support/ipad/mail/

Try this first - Reset the iPad by holding down on the Sleep and Home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.

Or this - Delete the account in Mail and then set it up again.

 Cheers, Tom 😉