The BGL has used the official bgmod.com's forums for many years now, but this has come to an end. There have been ongoing problems on the BGL subforum which were reflecting badly on BattleGrounds mod community, as well as the league. Therefore, the BGL will no longer use the bgmod.com forums and the subforum has been removed.
Communication with division admins can still be done through Steam, IRC (#bgl on GameSurge (NA) or QuakeNet (EU)), or email. There are no immediate plans to start a replacement forum for BGL at this time.