How do i run a half life mod off steam?

ok, i've downloaded and installed the mod Afraid of Monsters DC

i know i've installed it right, but now i'm wondering how (when in steam) i actually launch the game

meh, never mind

it just took a little while for the game to show up in the "my games list"

you have to restart steam after the installation for the mod to appear on your list.purple_MAN1832