First: how do i change my forum avatar, if it's possible?
Second: in the forum profile, i found "Permission Groups", in which there's an option to join a "Game Master - Trial", what is that?
Your forum avatar is the same as your ingame avatar, it's called a Custom Account Icon (CAI). You change it using the game engine and it automatically changes here as well.
Permission groups are a forum property that determine what boards you can view. As a moderator I have access to private forums specifically for administration, for example. I'm not sure what would happen if you opted to join that as a trial but I doubt it would work. Game Masters are in charge of managing ingame reports and you have to apply to become one.
Please PM me if you have further questions, as Off Topic isn't really the place for this discussion
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