How to add another email to my Apple ID account?

Hi mayrafrombrooklyn,

Welcome to the Apple Community.,

where some of us do our best to help each other troubleshoot.

Am wondering:

If you want to add an e-mail address to your Apple ID account ?

If so:

1. Sign in to your Apple ID account page.
2. Click Edit in the Account section.
3. Under Reachable at, select Add More.
4. Enter your additional email address. Make sure you're not already using it as an Apple ID. 
5. Apple will send a verification to that address. Didn't get the email?
6. Enter the verification code and click Verify.

Or

If you want to add another email account to the Apple Mail app on your iPhone ?

If so:

This online article (link below) from Apple Support can guide you.

Add an email account to your iPhone, iPad, or iPod touch

https://support.apple.com/en-us/HT201320

Hope one of these solutions helps solve your query :-)

You're welcome, mayrafrombrooklyn!

Thank you for your reply,

and

for letting us know you received the help you needed.

All the best :-)