Good evening Carolyn and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the struggles you have encountered trying to activate Community Events on your website. I would love to help you with this topic.
The good news is that we do have one single place to handle all of the license keys.
What is going on is that for the Community Events license key to appear under Events -> Settings -> Licenses, you first need to download and activate the Community Events extension.
You can read all about this here: http://theeventscalendar.com/knowledgebase/new-user-primer-community-events/
Let me know how that goes.
Best regards,
Geoff B.