[Catalog-sig] Trouble changing my email address

[Gary Poster]

Hi.

I need to change my email address on PyPI but I'm having problems.

I log in, click on "Your Details" on the top right, and try to change  
my email address.

If I try to just change my email address, I get this error message:

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Error processing form
  password is required
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If I then enter my password (in addition to my email change), I get  
this error message:
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User registration

user "gary" already exists
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Could someone help?

Thank you
Gary