No one in my server can build/place blocks (except operators)

Hello,
If you aren't op in my server and you want to place/brake/interact with a block it shows a message with: 'U cannot use dirt or this block is cursed etc'. I think this has to do with Modifyworld but I don't understand the plugin that good. Can someone please help me fix this permission?

here is what the plugin looks like:
informPlayers: true
itemRestriction: true
whitelist: false
use-material-names: true
drop-restricted-item: false
item-use-check: false
messages:
message-format: '&f[&2Modifyworld&f]&4 %s'
default-message: Sorry, you don't have enough permissions
modifyworld.items.use: Stop, &a$1&4 won't fit into &a$3
modifyworld.login: You are not allowed to join this server. Goodbye!
modifyworld.blocks.interact: You are too jelly for &2$1
modifyworld.blocks.place: This is wrong place for &a$1
modifyworld.blocks.destroy: '&a$1&4 is tough for you'
modifyworld.damage.deal: Your level is too low for &5$1
modifyworld.chat.private: Listener is deaf
modifyworld.chat: Your mouth is too dry
modifyworld.items.have: Prohibited item &a$1&4 has been removed from your inventory.
modifyworld.items.drop: This is indecent to scatter &a$1&4 around
modifyworld.items.hold: Beware, &a$1&4 is cursed!
modifyworld.items.craft: Sorry, but &a$1&4 is too complicated
modifyworld.items.enchant: Sorry, &a$1&4 is too dangerous
modifyworld.vehicle.enter.boat: You are too heavy for this &a$1
modifyworld.vehicle.enter.minecart: Sorry, but &a$1&4 is too small
modifyworld.vehicle.destroy: This &a$1&4 is legal property of &bUnited States of America
modifyworld.tame: This &a$1&4 is too ferocious
modifyworld.bucket.fill: This bucket is holey
modifyworld.bucket.empty: You suddenly realized you still need &a$1
modifyworld.usebeds: You can't sleep yet, there are monsters nearby

 

Wrong Section

 

Moved to Bukkit Help.

 

In your permissions plugin, give them the permission: