If you are talking about a Firefox Account for Sync or other services, you need to create a new account with that new email address. With a Firefox Account the email address is the primary identifier and the system is setup where that can't changed, currently. Some mention changing the "system" recently, but no firm information as to if or when that might happen.

I have the problem solved. I am using a different username and a different password than I mentioned in my post (Carol Allan).

Actually, I would not have posted such "private" information if I knew it was going to be there for everyone to see. Because of the fact that the posting is public information, I will not be using either the username or password in any of my login information. The username and password have been "retired" and "trashed."

Thank-you, "the-edmeister-3," for your contribution to solving the problem.