Mac Gaming Mods

I'm VERY new to this stuff, so pardon me if i sound like a dumbass.

I Downloaded the XMapPack, interested in trying out some new fields, but am not sure exactly how to set it up so I can play in them.

Drag the XMapPack folder into your Mods folder. Next go ingame and activate the mod. Once you activate the mod you will be able to select the maps from the server settings.