How do I get this plugin to actually work? It's installed but NOTHING happens.

I paid for, installed and downloaded the Appointments plug plugin. It generated a page on my site. I used my wordpress dashboard to make that page a sub of another page. When I click on a day, nothing happens. I used the control, shift, + j to see if there was anything wrong with my code. There were no errors whatsoever. I've built my site myself. I'm not a coding pro but I do not understand what is wrong and why this plugin just doesn't work. If it's not going to work, then I'd like my money back. Thanks.