How to jail break ipod touch with OS 4.2.1? 4th gen

Help please T^T

Greenpois0n.comOr, if you have a Mac, http://blog.iphone-dev.org/

thank you. um after u jail break it where do u get ur game apps?????????? i need help

go to cydia, then manage,sources, edit, add, cydia.hackulo.us, add source, wait, click on hackulo.us in the sources section, then install installous (:

thanks so much