Hello @peter59, If you are wanting to change your email used here on the Support Forum, just click the "Profile" button on the top of the forum in the black navigation bar and in there you can change your email. Just change what you want it to be and click Save at the bottom.
Only this "You must fill in the required fields." I did complete all required fields, but on clicking save the old e-mail is displayed and the fields are empty.
Ah! One other thing, go to the new email that you are trying to use and there should be a validation email from Forumotion. Make sure you accept it to validate the new email.