First launch call of duty black ops 1 multiplayer, after that go to server browser then unranked (server browser > unranked) then scroll till you find a server called /UU/ ZombieAnnihilation once you find it double click it then wait till the mod is done downloading. then play the game rank up level u get skins get more classes more camos, and get more stuff. for more help or something go to undeaduprising.net or join the discord.