It's so ez you just right click their name and go to roles and press the role you want to switch them to
If you go to server settings or whatever that thing is and click roles, you can create a fun role with perms
Top right corner theres a icon that shows the full list of people that are online and offline if you meant that
I can see that, but only I am there. Others have joined but went offline and theres no history of them??