how do I change the mail set up for me?
How do I change my iCloud mail address
How do I change my iCloud mail address
See this -- Change your Apple ID - Apple Support
Are you talking about the (usually non-Apple) email address which forms your ID and login, or the @icloud.com address which belongs to the account? If the latter, once you have created an iCloud account and chosen an @icloud.com address to go with it you can't change the address (short of creating an entirely new account).
However, all is not lost. You can add up to three 'email aliases' - these are additional addresses (not accounts) which deliver into the same inbox as the main account. (In fact it's a good idea to give out alias addresses, rather than the main address, because if they attract spam you can easily change them.)
You should be aware before you start that once you've created an alias you cannot turn that address into a full iCloud account or move it to another account.
More information on aliases here: http://help.apple.com/icloud/#mm6b1a490a
how do I change the mail set up for me?