Select "File > Devices > Back Up". This helps ensure that any data you have on your device can be later restored.
Download Absinthe for unjailbroken devices here.
Double-click the .dmg file to decompress it and drag the Absinthe icon to your desktop.
Step 4 - Run the Jailbreak
You'll get a quick security notification about opening an app you downloaded from the internet:
Plug your device in and run the jailbreak.
Your device will go through a few series of restore sessions and reboots.
You will be notified on-screen when absinthe has finished its work so don't unplug your device until you see this notification. When it's done, you can unplug your device from your computer.