Changing Privacy Settings on Facebook Groups?

[Gypsy]

I made a group on facebook and i had originally set the privacy setting so that only people in my network can join. But now i want to change it to global. is there a way for me to do that?

I know that if you click "Edit Group Settings" under the picture you can change it from Open to Closed to Secret, but I don't see anything that will allow me to change the Network specification.