You can easily add / remove an email (and iCloud) account on your iOS device (iPad, iPhone or iPod touch). Simply tap Settings > Mail, Contacts, Calendars > Add Account. To delete an email account from your device, tap Settings > Mail, Contacts, Calendars > select the email account you want to remove and then tap Delete Account. If you are unable to delete your mail account (Exchange, Google, Yahoo, Outlook or Aol), here is how you can troubleshoot:
- If you are still having problems, it is likely that your device have Profiles installed, especially if you received your iPhone/iPad from your organization, e.g., your school, company etc.. If you need a passcode to delete/edit a profile (e.g., Mail), you need to contact your system administrator. You can see your profiles in Settings > General > Profiles. Tap Settings > General > Profiles and then delete your mail account.Try resetting your iPhone or iPad by pressing and holding the Sleep/Wake button & Home button at the same time until you see the Apple logo. Your device will restart, now try to delete the mail account.
- If resetting does not work, it might be that you prevented changes to Mail, Contacts, Calendars by enabling Restrictions. Tap Settings > General > Restriction > Allow Changes: Accounts > and select Allow Changes. (ignore this step if Restrictions are disabled)