Changing Primary e-mail address

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Well I searched the archives and believe I remember how to post a
photo, but now I can't send the e-mail because I didn't use the e-mail
account I used when I joined the group.

I went into my account page to change my e-mail and I can't find any
way to change it. It lists my new e-mail as my secondary e-mail, but
won't let me make it my primary.

Any advice?
Brock