can't add listing from front end

I'm trying to set up the new Directory plugin.

On the front end, I click "sign up" and get this message:

This feature is currently disabled by the system administrator.

I've gone to payment types and selected free (no change) and then paypal (no change).

However, if I am logged in, then sign up changes to " go to profile and add listing".

So... how does one sign up and login?

Thanks
Lori

PS I have the directory set up on a sub site on multi-site. The directory is one of the things we are offering, it is not the only thing. Not sure if that makes any difference.