How to add my iPhone number to iMessage on iPod touch?

I have an iPhone 5 that is currently registered to iMessage with my phone number. I also have an iPod touch 4th gen. I saw on the apple website that I can hook my iPhone's number onto my iPod. I tried going into settings> messages> send &receive and my phone number showed up. So i tapped on it and it connected. But a second later, it logged me out of iMessage and made me log in again with my Apple ID. So i did, but it unhooked my phone number from being able to send & receive messages from. I tried logging in and out of imessage again, and then turning imessage on and off but nothing seems to be working.

You can't, ipods are not phones so email address only can be used on that for messaging.

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