Summarize this article in one sentence.
If you think your iPod Touch may have been lost or stolen and you don't have Find My iPod, you should change your Apple ID password immediately. This will protect the data in your iCloud account and Apple Pay. You can change your Apple ID password at appleid.apple.com/. Besides changing your Apple ID password, you should change any other passwords for services you accessed from the iPod. This could include Facebook, Twitter, your bank, email, or anything else you may have logged into from the iPod. Without Find My iPod enabled, there is no way to track your iPod. To find a lost iPod without Find My iPod, you'll have to find it the old-fashioned way. Think back to the last place you remember using it and try to track it down there. Make sure to look for places it could have fallen into, such as cracks between the couch cushions or between car seats. If you're sure your iPod has been stolen, you can contact your local police department to report it stolen. You'll likely need to give your iPod's serial number, which you can find on the box or at supportprofile.apple.com if you registered your iPod with your Apple ID.

Summary:
Change your Apple ID password. Change your other important passwords. Retrace your steps. Report the iPod stolen.