How do I get rid of an autofill spelling error? Every time I use my email address to log in to a web site an auto prompt comes up with a misspelled email address and if I am not careful and forget to hit the X I enter the wrong email address. I

How do I get rid of an autofill spelling error? Every time I use my email address to log in to a web site an auto prompt comes up with a misspelled email address and if I am not careful and forget to hit the X I enter the wrong email address. I've tried to follow the directions I found in Apple Support but it's not working. Can you be more explicit. Do I underline in the original the bad replacement or what I want it to be? I've tried both ways but it just changes it for the one time and does not remove it from the list of suggestions.

Thanks for your help.