okay so ive been reading people say "region my house" and "protect this city" so im guessing that is what makes it say "you do not have permission to build here".
if so, idk who to ask or where to post to get that done to my home because im building a massive underground airdome and i dont want anyone flooding it :O
but im posting it here becuz i dont just want the area that is there right now... i need a much larger area to be protected becuz i just found an underwater dungeon with lots of minerals and i dont want the spawners destroying everything Dx  

Spawners don't destroy things- they kick your ass due to negligence of being too close to a spawner. o_o