Hi, and thank you for asking your question.
When setting up the account on the iPad, when you are shown the AT&T prompt, please tap Next first, and then fill out the following server settings:
Incoming (POP) Settings:
Full email address and password
Outgoing (SMTP) settings:
Done that, check if you are able to add the Charter account with these settings. If you need any further assistance with this issue, please be sure to reply back using the box below.
Otherwise, if you could kindly click on (and submit) one of the stars at the top of this page to rate my service, I'd greatly appreciate it. Thank you.