Controlling Ning Groups as Administrator

Hi World,

I will post on my own discussion, that I've had on this topic but not sure if it shows up on top. Today I excitedly started inviting my students by assigned periods/groups to joing my ning network. I invited them by making up six individual periods into their own groups and then inviting friends for each. However, when I go to my main page and press members, they all show up on the main page.

I only want students to access to their indivdual groups/periods. I thought I could do this as an administrator? Can anyone please tell me what I have done wrong???

I was able to invite them to the group, but they are still showing up on the main page which I don't want to happen, because then they will start chatting with their friends from other classes.

Please help help help