[Solved] Last edited

[Lynne]

The above setting only controls whether Edited By gets shown when a user IN that usergroup makes an edit. If you want the Edited By to show to users, just not unregistered users, then you would need to put a conditional around the code in the postbit (or postbit_legacy) template to not show it to guests.

edit: Actually, Mark's plugin below is a better solution than editing the templates.