Blackberry MDS

So I'm sitting here working my ass off trying to get BES MDS to work. I finally have it working, but I have no idea how to register devices. Then since upgrading to 4.1 SP2, LCS seems to be a working option now. Cool, but how do I get Enterprise Messenger installed on my blackberry now? Do use MDS to push it out? I'm looking on blackberry's site, I'm dizzy and sleepy. urgh....