Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
@stoqns14 I don't know what it's like in Retropie, but in PrBoom in Recalbox you can see in the documentation how it works: https://wiki.recalbox.com/en/emulators/ports/doom/libretro-prboom