I am a new registered user. I have no clue, nor a clue how to get a clue, to start anything. The jammr front end says there are 10 users jamming right now. Another page says I am logged in, and that only 1 person is logged in right now. Jammr has been around since 2015 or so. What the heck?

Hi,
In order to jam you need to download the jammr application: https://jammr.net/download.html

An overview of the user interface is here: https://forum.jammr.net/topic/1727/

Please let me know if you have any other questions!