How do i install hl2 source mods?

[heldermelder]

im trying to install this mod, ive tried putting the folder in multiple places in my valve/hl2 directory but i cant get it to load or anything. Help please. Thank you

 

[$kelet0r]

put it in your source mods folder

 

[Ennui]

Steam/SteamApps/SourceMods