Thanks, I somehow missed that I needed to setup a category first. Apparently people can sign up for newsletters without specifying a category.
I'm going to add that as a required field if I can figure out how to do it. Might be something to add in the next version.
Another question related to this. If you import names and e-mail addresses do they receive a subsription confirmation e-mail or are they just added? I see no way to edit a user account in the admin area, like adding a category to their profile.
I have a client that is really interested in this app.