Go to Yahoo options>Mail Options>Account Information. There you can edit your password, primary email address and many more.
I have the same exact problem can somebody help me as well?
You could just make a new yahoo email
Go to your yahoo profile, click edit. Then go to profile information. If it's there you should be able to switch between your main email addy and a second one.
You sign in go to account's and where your email is click edit and change it