Enroll Button Not Showing, etc.

So, maybe I'm an idiot, or I must just be missing the documentation, but I've set up the plugin according to the documentation I've found and just seem to have layer after layer of nothing anyone can enroll for. In the examples in the "documentation", it just appears. I don't have the option of selecting "anyone" can register in the backend. There is nothing in the general settings that I can see that would allow that. I saw a support post from 2015 that involved changing code via FTP, but surely that's been resolved. I'm thoroughly confused. Does it not work with my theme? Am I missing the real documentation? Maybe there are videos somewhere? Any guidance would be appreciated. I want to love this. Can you help me love this? Thanks.