“As Channel Managers of teams, you have to assign yourself in positions on the team that you want to participate in. Example: As a CM, I have to add myself as a Greek Moderator & Greek Subtitler if I plan to hold these positions and participate in these roles.”
They explicitaly stated that here:
So I guess you have to assign yourself mod + editor + subber, if you want to moderate a team, edit subtitles and write new subs