Wow.
Okay, firstly, ULX is a server plugin to assist admins in keeping their server well managed, it can do many things, like freeze players, kill them, ban them, but the biggest part about ULX is the fact that admins can be given 26 different admin levels (A-Z), for example, root admin gets all abcdefghijklmnopqrstuvwxyz, but his friend wants to be admin too, so he gets a, for, let's say setting reserve slots, and c, let's say killing players. There's just acouple of examples. Also, I'm sure I won't have to explain where to put the files, just read the readme. And a quick browse on the forum will tell you what ULib is.