Mod should come with a readme no?
it will tell you how to setup a shortcut to start your game with the mod, so a basic rundown of this would be like this:
C:\Program Files (x86)\Steam\SteamApps\common\Arma3\arma3.exe" -nosplash -mod@CBA_A3;@CAF
bolded is what you apply.
Thats just to launch the game with the mod, if you already know this, then everything is done through the editor.