put the .jar file in your mod directory, either %appdata%/.minecraft/mods/ folder for the vanilla launcher or your own instance folder. You have to find 5 (or more ...

Soul Beads are items added by the Quark mod that point in the direction of the nether fortress when used. I created a 1.18.2 modpack with just Quark and they work correctly, but if Better Fortresses ...