How to Jailbreak iPod touch on iOS 4.2.1 using Greenpois0n [Mac]

Chronic Dev Team has launched greenpoisOn which supports iOS 4.2.1 and iOS 4.1. So you need to first update your iPod Touch with iOS 4.1 or iOS 4.2.1 to use greenpois0n. Here are the following step and instructions to jailbreak your iPod Touch: Step 1. Go to http://www.greenpois0n.com/ and click on the Mac icon to…