Codyth

Hello, I'm an admin/op on this fairly newish Tekkit server, and I made a couple electric furnaces for people to use in spawn, but one thing, when people try to use them, it tells them "You don't have permission to open or use that Tekkit item here". How can I allow them to use them? I tried doing "/region flag spawn use allow" but that didn't work. Any help would be much appreciated. Thank you.