I have been running MW@H for about 2 years on one computer. I have just bought another machine and downloaded BOINC and MW@H. Unfortunately, I miss-typed my email address and the erroneous address was accepted. When I try to enter the correct address, the system tells me that the correct address is already in use, and will not change that on the new computer. They now have different user ID's.

How can I change the email address on the new machine to match that of my other machine, and then get the system to accept that they should both use the same user ID?

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make sure the dialog is not for "new user". click on "existing user" and use the old email.