Change default email

Change default email

At initial setup, I made the wrong email address my default.  I can't seem to find how to change it to what I want. To clarify: I initially set "office@..." to be my default, but I want "admin@..." to be the default.  When I try to change it to "admin@..."  under my "Profile", I get an error that the email already exists, which of course I know, I just want to change the default address to this.