1,SSH
2,Download installer.app form here -
http://iphone.nullriver.com/beta/
3,Copy the Installer.app folder into your /Applications folder.
4,Open installer app folder and Right click ditto and select "Properties",then change the settings to "0755"
5,Now right click Installer and select "Properties", then change the settings to "0755" also.
6,Restart your iPhone, and you'll see the Installer icon on the SpringBoard.
7,Enjoy..!!!