Did you try a web search or check the Apple support for the answer?
I found this article quickly with a web search.
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
I know logins can get crazy these days to keep track of, and the Apple ID is part of the long list you probably have. In terms of the email account, it can be changed via the link that Ann154 shared. Within her link will be another link directly to the 'Change your Apple ID' page (http://spr.ly/66061tez2).
If further assistance is needed regarding this matter, you can always reach out to Apple directly - http://spr.ly/66071tezN
Keep us in the loop with your success!