SkyBlock problem

So I have a skyblock pluggin on my server iriduimskyblock the pluggin works good and everything but there is a big problem players can't break, place or interact in the island is like if they dont own the island please help me fix this issue so my server can have skyblock as a new gamemode.

I do have worldguard

Ok I will check thanks for helping me if it doesnt work then I will reply again.

ok sadly it did not work only players can interact with their islands when they have op I think I gotta add a perm or something I still need help.