I think this question came up before. I am not sure, they may have changed things, but the solution once was that you had to re-join with the new address. Use your old name plus something else, like nannc2 or nanncy

I just updated my member information, i.e., email address, year of birth, etc. I managed to find "Member Services" by clicking on "Instructions". If you can find that, I think you'll be able to do your update.

Nannc:

If your email addy was incorrect, you would not have gotten my response to you that while I received your request and am happy to mail you seeds, you did not give me an address to which to mail them. Could you please send me an e-mail with a mailing address for you? Thanks!