Yayami OMate

Where can i report players? Today i meet two guys which stealing traders from other players. I attack trader brig (i was first player in battle), then they come to steal it. When i manage to board trader (also first) one of them pushed me forward so boarding was interupted. Then they board trader. http://steamcommunity.com/profiles/76561198034186478/screenshot/312243491187198231