Wow, I wish finding the documentation was easier. After much searching, I saw one post with this answer but did not understand it:
"Documentation of Events+ is inside the file. If you click the "info" icon inside the Addon there is a detailed description there."
What file, where? What is "Addon"?
Is there documentation, and specifically where?
Perhaps it could help with my other problem: the paypal button after RSVPing is massively ugly! I suspect this has to do with CSS ... but where and how to fix it?