hi part of me being back i forgot to give a guide on sumn mb!! :(( (happy birthday 2 madvillainy) (late though)
step 1. grab your device compatible with redsn0w (iphone 4, 4s, ipod 4, dude anything that has iOS 6)
step 2. download redsn0w from https://sites.google.com/a/iphone-dev.com/files/home/ make sure to get 0.9.15
step 3. important..... download itunes 11 and replace your modern itunes with this (make sure to uninstall EVERYTHING APPLE RELATED besides device support) no link though sorry
step 4. connect your idevice and open redsn0w. click jailbreak & cydia should install.
step 5. congrats, your ios 6 device now has cydia. go get tweaks and be the envy of your friends
the cheating way: get 3utools, connect your idevice, go to jailbreak and press "run jailbreak", then you should see cydia after. but 3utools is actually spyware LOL