There is no option…
Hi Wahid. I think the profile picture is the same as the one on your ICM profile, as the Discuss forum is just a subdomain of the main ICM website.
You can change your avatar here: https://www.icheckmovies.com/settings/avatar/
But I still see my avatar from years ago here. I have changed my avatar on the main site multiple times since. Nothing changed here.
Yes, I also changed the avatar on main site.
Then I have no clue
Sounds like a question for Marijn directly, J.