Q: My i-pod fifth generation is not working both because of the change of address and also because of the change in password!

Place the iOS device in Recovery Mode and then connect to your computer and restore via iTunes. The iPod will be erased.

iOS: Forgot passcode or device disabled

If recovery mode does not work try DFU mode.                        

How to put iPod touch / iPhone into DFU mode « Karthik's scribblings        

For how to restore:                                                             

iTunes: Restoring iOS software

Then to setup the iPod yo will have to enter the ID and password last used in Settings>iCloud on the device.

If necessary:

Is there a way to find my Apple ID Name if I can't remember it?

Yes. Visit My Apple ID and click Find your Apple ID. See Finding your Apple ID if you'd like more information.

How do I change or recover a forgotten Apple ID Password?

If you've forgotten your Apple ID Password or want to change it, go to My Apple ID and follow the instructions. See Changing your Apple ID password if you'd like more information.