bro do step by step ok
1. connect your ipod with itunes
2. now press home and power button for 6 sec. when ipod go off recently relese power button but still press home buttom for 6 sec . u see in itunes your ipod connect in d.f.u mode.
3. click on restore wait for download itunes softwaer for your ipod.
4. when download complete your phone restoreing ,.after restore.
5. u se only cabel pic on your ipod screen
6.now connect your phone with itunes itunes jailbrake your ipod .
7. done.
click on thanx button . bhai