How do I reset my iPod 4, I forget the passcode.

If you cannot remember the passcode for the Screen Lock, you will need to Restore the device...

1) Connect to iTunes on the computer you usually Sync with and Restore...

http://support.apple.com/kb/HT1414

2) If necessary Place the Device into Recovery mode...

http://support.apple.com/kb/HT1808

Note on Recovery Mode.

You may need to try this More than Once... Be sure to Follow ALL the Steps...

Once you have Recovered your Device...

Re-Sync your Content or Restore from the most recent Backup...

Restore from Backup > http://support.apple.com/kb/ht1766

Locked Out, Forgot Lock or Restrictions Passcode, or Need to Restore Your Device: Several Alternative Solutions

A

1. iOS- Forgotten passcode or device disabled after entering wrong passcode

2. iPhone, iPad, iPod touch: Wrong passcode results in red disabled screen

3. Restoring iPod touch after forgotten passcode

4. What to Do If You've Forgotten Your iPhone's Passcode

5. iOS- Understanding passcodes

6. iTunes 10 for Mac- Update and restore software on iPod, iPhone, or iPad

7. iOS - Unable to update or restore

Forgotten Restrictions Passcode Help

iPad,iPod,iPod Touch Recovery Mode

You will need to restore your device as New to remove a Restrictions passcode. Go through the normal process to restore your device, but when you see the options to restore as New or from a backup, be sure to choose New.

You can restore from a backup if you have one from BEFORE you set the restrictions passcode.

Also, see iTunes- Restoring iOS software.