Block I.P.'s

I have my installation up and running. Either I'm missing something or there is no way to set it to have me approve people. It just uses their e-mail. I guess that's OK.

However, I would like to add some I.P.'s to a ban list and for the life of me cannot make it happen. There seems to be no such place to do it. I see a button called ban. It won't let you ban someone who is not signed in and there is no where to ban an I.P.

I'd appreciate some help. Thanks