Q: my phone has old act. info, my computer the new info,i had the phone sync to the comp can't get new info on phone

i have an i4s os ver 7.1.2 (11D257) i needed to change my act. info, new email and password i synced my computer on   itunes and made the change, every thing went well i thought, but when i disconnected from the computer the phone still has old act. info and i do not know how to change the phone.

i can enter the new act. info on the phone but it does not stick as soon as i close out and try to log in to itunes on the phone it has the old email and will not except any password, thank you,        Frustrated, Rocky Fingers. ps, computer is win 7 home prem.