HELP! why can't i play a WoW private server?!?

Hey I was wondering does anyone know why i can't play WoW private servers for some reason? Everytime i change my realmlist to what the private server says and stuff but when i start up WoW and try to log in it doesnt let me and then if i type in my regular WoW password and user it brings me into my regular WoW... show more Hey I was wondering does anyone know why i can't play WoW private servers for some reason? Everytime i change my realmlist to what the private server says and stuff but when i start up WoW and try to log in it doesnt let me and then if i type in my regular WoW password and user it brings me into my regular WoW retail realm??? I have even deleted everything inside the realmlist.wtf file all the realmlist and patchlist stuff once and i still ran wow normally >..< if anyone knows how to fix this and how i can play a private server pls help ;o * and if its any help i use a mac *
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