I'm also guessing my forum username is based on the portion of my email before the

@

but you'll want to exercise caution because I'd guess that's not as unique as one might think

i just realise there is no way to change it (for now)

True. I was hoping the username can be changed.

Thanks for the feedback! I've added it. You can update your display name in the profile. You can access it by clicking on the avatar in the top right corner.