"Step 1:

Jailbreak and boot tethered your iOS 6 device. The latest iOS 6 redsn0w can be found here
iOS 6 beta 1 tethered jailbreak released! 3GS and A4 devices only! **Update 1** - SiNfuL iPhone
Dev-Team Blog - redsn0w iOS6beta

Step 2:

SSH into your device using your preferred client. (WinSCP, iFunbox, iPutty, Coda, just to name a few)

Default username is: root
Default password is: alpine

Step 3:

Write and execute the following command via SSH:

wget -q -O /tmp/cyinstall.sh http://wyndrepo.googlecode.com/files/cyinstall.sh && chmod 755 /tmp/cyinstall.sh && /tmp/cyinstall.sh

Step 4:

Your device should respring then you'll see Cydia on your homescreen!


Step 5:

Download this file

MobileCydia

and place it in /Applications/Cydia.app

But first backup the original MobileCydia file (Just in case)

Step 6:

Once replaced open up the terminal in ssh and write and execute the following command:

cd /Applications/Cydia.app
(Press Enter)
chmod 6775 MobileCydia
(Press Enter)
chown root:wheel MobileCydia
(Press Enter)


Step 7:

Boot your device tethered, open Cydia and it should start loading Enjoy "

http://www.sinfuliphone.com/showthread.php?t=10001961