Unless it's jailbroken, you need to do a factory restore in itunes. you will lose all settings and progress in apps (mainly games) but not apps themselves, or other downloaded content.
It depends on what iPod you have.
I have an iTouch.
For the iTouch here's what you do:
1) Hook it up to your computer
2) Open up iTunes*
3) Restore it** You will lose everything but at least you can...
Press the SELECT button and enter the 4-digit number "7444" whenever the Parental Control display asks you for your password. The old password is deleted. You will then be prompted to enter a new...
On facebook type in your username and what you think is your password and if your password is wrong it will bring you to another screen and then you can click forgot password.