If you are not the original owner, you will need to contact them and have them remove the iPod from their account. You can't just reset it yourself and remove the original owner, otherwise thieves would be able to easily use stolen iPods and iPhones, and obviously we don't want that to be the case.
"...contact them and ask them to follow these steps to remove the device from their account:
1. Sign in to iCloud with their Apple ID.
2. Go to Find My iPhone.
3. Select All Devices to open a list of devices linked to their account, then select the device to be removed.
4. Click Remove from Account.