How to get on a hunger game server in minecraft?

I have FTB unleashed cracked, http://ftbwiki.org/Feed_The_Beast_Unleashed this a link to exactly what i have but my mac only lets me play the regular version. It was airdropped to me by a friend. I really don't know much about all the versions and alphas and stuff sorry i'm a noob. But i have been seeing these cool hunger game servers on youtube and i really want to play on one but i have tried and tried but i only get on a server and it fails i don't know why or how to fix it. If any of you have a solution or know any severs that would work please help a brotha out.