For the most recent configuration settings to use for your device, reference your cPanel instructions for Device Configuration. On the cPanel device configuration page, there is a list of popular devices available, as well as a list of common settings to use in a typical email program.
The video below may help for older versions of iPad Mail.
*NOTE: The username field has been updated. Please use your entire email address as the format of your username. For example: john@yourdomain.com.