The Settings on the Forums will not allow address change. Filemaker.com will.
From another Thread.......
To change your email address, perform the following steps:
1. Go to our FileMaker web site at http://www.filemaker.com
2. Click on the Support tab and select Knowledge Base
3. Just above the Search box, there will be three tabs. Click on "Your Account". If you haven't logged in, then do so at this time.
4. Under Settings, click the link "Update your account settings".
5. Make the change to the "Email address" field, and click Submit.
Let me know if you run into any difficulty.