If you want to set up an email that is not one of the email addresses on the email panel
Go to settings Left panel Mail, Contacts, Calendars> Right panel Add Account

Touch Add Mail Account

Select other
at the top right panel Touch Add email account
add your Name or alias, email address, password and your description of the account

and touch save, it will say Looking for account
It will show the panel below, so you will need to fill in your details

Touch Save
At the top of the panel it will say Verifying, once verified you will be able to send and receive mail.
However you may have a pop up about SSL, Touch Yes
Touch SMTP

Touch SMTP

Ensure your details are correct, SSL ON, Touch Authentication

Enusre Password has a tick

Save your settings by going back and touching done
You will be able to send receive emails