To play on the 3DX Mine Craft Server you need to download the FTB (Feed The Beast) Launcher from there website http://www.feed-the-beast.com/ or a direct link to the Launcher EXE http://www.creeperrepo.net/direct/FTB2/cceae61750e7c5d031213e5beb47925b/launcher%5EFTB_Launcher.exe or the Jar File http://www.creeperrepo.net/direct/FTB2/cceae61750e7c5d031213e5beb47925b/launcher%5EFTB_Launcher.jar as we run a modified version of there mod pack

Once you have downloaded the Launcher, start it up and select the
FTB Monster V1.1.0 Mod Pack, sign in with your Mine Craft Account and
let Mine Craft Start up

Once started click on Multiplayer and add the server address of
Play.3DXMc.co.uk and join our server and start playing, have fun, and
get Mining!