Hi David,
Welcome to Apple Support Communities.
It sounds like you are unable to delete emails on your iPad and you aren't seeing the Trash folder for your email account. Try the resolution in the article linked below, which appears to be for the same issue that you described.
iPhone and iPod touch - Unable to delete email messages
http://support.apple.com/kb/TS2475
Resolution
To resolve this issue go to Settings > Mail, Contacts, Calendars > [affected account name] > Advanced > Deleted Mailbox on iPhone or iPod touch.
If "On the Server" is an option, select Trash below that (or select Deleted Items or Deleted Messages). Otherwise, select Trash located under "On My iPhone". Once the Deleted Mailbox has been set, tap Advanced and then press the Home button to return the Home screen.
If the Deleted Mailbox is already set to Trash, please follow these steps:
- Tap another folder such as Spam under the "On the Server" section
- Tap Advanced.
- Tap Deleted Mailbox, then set it to Trash located under On My iPhone.
- Tap Advanced.
- Press the Home button to return to the Home screen.
Also, if you haven't already, go ahead and update to the latest version of iOS that's available for your device.
Update your iPhone, iPad, or iPod touch
http://support.apple.com/kb/ht4623
I hope this helps.
-Jason