change a send and receive address in apple messages

You can add additional email addresses for iMessage in the settings for your Apple Account:

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Many people have more than one email address that friends and family use to reach them. You can add additional email addresses that you commonly use to your Apple Account, so people can easily find and communicate with you on Apple services like FaceTime, Messages, Photo Sharing, and Find My, and collaborate with Pages, Numbers, and Keynote. Apple might also use your email addresses on file to send you information about your account.

Add an additional email address

1. Sign in on account.apple.com.
2. Select Sign-In and Security.
3. Choose Email & Phone Numbers, then select the Add (+)button.
4. Enter your additional email address. This additional email address can’t already be associated with a different Apple Account.
5. Apple will send a verification to that address. Didn’t get the email?
6. Enter the verification code and select Continue.

Delete an additional email address

1. Sign in on account.apple.com.
2. Select Sign-In and Security. 
3. Choose Email & Phone Numbers.
4. To delete one of your additional email addresses, click the Remove button(-)next to the address.

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copied from: About your Apple Account email addresses - Apple Support