borrowed steam account

i borrowed a steam account from my friend because i wanted to play counter strike source. i set up steam and logged on but how do i redownload games that he has already bought?

 

I'm gonna use Team Fortress Classic as an example.

First, goto My Games. Next, select Counter-Strike: Source or whatever game you want to install. Click the install button when it appears.

 

thanks for the pic. but for some reason the game isnt showing up in the game menu. maby i will just get my own account and just buy the game.

 

Are you sure you clicked the sign next to the Not Installed part?

 

the list is completely blank. it is not showing the games that he has purchused.