Q: How can I switch my account to my other email address

CHANGE ID

What to do after you change your Apple ID email address or password

The ID is used in the following locations and you  have to change them.

Settings>Messages>Send and Receive

Settings>FaceTime

Settings>GameCenter

Settings>iCloud

and Settings>iTunes and App store

You  have to sign out of ID (for iCloud you delete the iCloud account from the iPod) and sign in with other ID. Also when you delete the iCloud account from the device you will offered to either delete the iCloud data from the device or  leave it on the device

Note the following are resolved if you  use Family Sharing (iOS 8 and later):

- Apps are locked to the account that purchased them.

- To update apps you have to sign into the account that purchased the apps. If you have apps that need updating purchased from more than one account you have to update them one at a time until the remaining apps were purchased from one account.

If the iPod has iOS 7 or later then you have the enter the password for Apple ID presently sign in Settings>iCloud.

Also, a Restriction can be set (Settings>General>Restrictions) the prevents changing accounts

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You can also setup Family sharing if you have two devices:

Set up Family Sharing - Apple Support

Family purchases and payments - Apple Support

If necessary:

Family Sharing and Apple ID for your child - Apple Support