Answered question
Is there a way to change the name you use when posting comments in this forum?
I changed it twice to play on it. Here is how I do it. First go fizz.ca and login to your account. Change your name there. Then logout and wait 48 hours to 96 hours. And login to community.fizz.ca , then you find your forum name is changed too. It's not real time, need 2 to 4 days to reflect in community. Do it once and you'll know what I mean.
Other answers
I believe it takes it from your account profile, it would be nice of them to allow a screen name and keep the account name as is.