JWM: how set choose theme?

Hello, I installed JWM and ran it.
I surf the net but haven’t found good manuals about jwm.
I found a beautiful theme and copied it to the JWM themes folder, but I have not found how to apply it in my system.
Likewise, I changed walls in JWM with nitrogen (how to set up a slideshow in JWM?), and slightly customized tint2 (how to make it look like in Cinnamon/Plasma?).
Can you please help me and advise me on useful documentation about tint2 and jwm?

For JWM, there’s extensive documentation on the project’s website: https://joewing.net/projects/jwm/
Quite similarly, there’s official Tint2 documentation right here: https://gitlab.com/o9000/tint2/blob/master/doc/tint2.md

Ok, how apply theme to system?

You could also copy the contents of the theme file, but include option is much simpler.