You can now update your user name on the forum.
To do this, go to http://www.phaseone.com
Click on My Pages and log in.
Once you are logged in, click on "My Pages" and "Edit Profile"
The page you arrive to is summarizing your stored user information.
Here you can update your contact information and also update your forum username.
Note: Always use the "Check availability" since duplicated names are not allowed.
This feature can take a little time to return confirmation, just be patient.
Once done, click "Save and Continue"