Alright so what you need to do is.
1.) Download Bittorrent
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I would use Bittorrent because I think its a lot faster with torrenting games.
2.) Install it then go on
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3.) Once you find the game you want you click on the magnet to start your download in your torrent program
4.) Once your download is down open the game folder then open go on your ps3 into a FTP then open filezilla
Note* to open the game folder you just right click on the torrent and click on open containing folder
Everything you need go bring onto your ps3 should be there.
5.) Connect to filezilla then open up the GAMES folder and drag the game you torrented into there.
Note* It will take a few hours depending on the game you got.
6.) Once the files are done and on your ps3 your all set if you run into any problems they can be fixed in multiman easily.