I can't find anything in the documentation that says how to load a mod in my own custom server. I know it should be possible to do it somehow. The in-game server browser lets you sort servers by the mod they have loaded (although I don't see any mods out there). The download page for the community dedicated server clearly says, "This package allows you to host your own unranked Crysis 2 server as well as custom maps/mods!"

i think you have to build it first.
download the zip and extract to wherever it says. there should be a pdf somewhere with instructions.