I used iNdependence to jailbreak my iPhone (Which took a lot of treacherous work), and I installed installer according to the post http://www.modmyi.com/forums/showthread.php?t=37161 but I don't understand the rest of the directions:

SSH into your phone and issue the following commands:
chmod 777 /Applications
chmod 777 /Applications/Installer.app
chmod 777 /Applications/Installer.app/Installer

Can someone please help me out? I was able to get into the phone using cyberduck so that's not the problem. I just don't understand what you have to do next.