How can I unify my IPhone and IPad ID and passwords

[iMore Question]

I have Apple IPhone 5S and Apple IPad . Each has ID and Password. I want both have SAME ID and SAME PASSWORD. What are the steps to unify them.

 

[Ledsteplin]

Welcome to iMore! Go here on the device you wish to change. Follow directions to change the ID and password.
Manage ID
https://appleid.apple.com/