It should probably be in dev category but that's not a big problem
Tell me do you have XMR configured?
Since you installed in via docker then it is pretty much already configured.
All you need to do is set the XMR public address in the CMS settings -> Displays tab
XMR will be listening for players on port 9505
so in public address you will want to put something like:
replacing the ip.address / hostname with correct values for your installation of course.
and what are the durations on your layout and do you have 'expire modified layouts' enabled in display profile?
As those settings can delay any changes you made from appearing on the player.