How do I remove misspelled ids from the mail login box. I am the typo queen and have about 8 misspelled ids.?

Under my various email accounts I have misspelled my id on multiple occasions. They seem to be there permanently and I can't get rid of the wrong ones - a total nuisance! Yes, it would help if I didn't type so fast and would edit my spelling - but in a better world...blah blah. Does anyone know how to remove all the misspelled ones? I've tried delete, I've tried right clicking and getting a delete choice...nothing works - so I'm out of ideas. Please help if you've an idea! Thanks! Jen