I cannot edit email account info or add new account

Question

On my daughter's iPad (iPad first gen, 32GB 3G), the lines for editing email account and adding accounts are grey/inactive.
I have reset (hard turn off/on) the unit, synced and updatet to latest iOS, but it still remains the same.
I think it may have happened after I hooked her desktop computer up to the same email a few weeks ago, and I know how to set it up correctly so the account will work on both units with IMAP - but I am not allow to edit or do anything with it on the iPad. 
Any tips?

Answer 1

I   N E E D   H E L P   T O O! ! !
Problem:  I have two Apple ID's
ID# 1 was  (and still is) my primary ID which has an email account assigned to it that no longer exist, therefore any purchases whatsoever are sent to this invalid email adress.
ID# 2 - I cannot access this account to make it the priority account on my iPad (due to ID# 1 being the primary account) so that all purchases can be sent to the email address accociated with this account.
Everything would be so much easier if I could just delete ID# and just use ID # 2 which as a valid email adress.
Even if I try to change the email adress within the settings for ID# 1on my iPad, and type in my current email address it gives me the error that this email address is in use and cannot be used.  Well, no kidding! I am the user and it is used for ID# 2 where it was originally setup.  basically I want to start over but how do I get my iPad to accept a new ID with an already previously used email which is associated with another ID???