Cracked minecraft forge mod downloader

I recently downloaded cracked 1.5.2 minecraft for MAC, and I wanted to install mods, so I downloaded MagicLauncher and when I tried to add a mod, it said "No Forge" and it didn't work, so I heard about a forge mod launcher, so again, I downloaded it and it didn't make any change. I'm pretty sure I did the process wrong, haha, so how do I install the ForgeModLoader correctly and use it correctly?( remember, I'm using a mac, and a cracked 1.5.2 minecraft )