Web results:
Tap Remove next to the email address. This is a red button next to the email address on the right-hand side. You will have to confirm your action in a new pop-up.
Click the "Your Email" text field below the "Create a new Yahoo Mail address" heading, then type in the email address that you want to use followed by "@yahoo.com". For example, to use "humpbackwhale" as your email handle, you'd type "humpbackwhale@yahoo.com" into the "Your Email" field. You can use letters, numbers, underscores, and a period ...
You have had too many unsuccessful attempts to login. You have been temporarily locked out. Please try after 20 minutes.