Neco: Did someone mention that there was a way to edit comments before? Going to go check the help posts.
Bonnie: No, sorry, no way to edit posts ... EXCEPT by deleting the one you didn't like (you as commenter can do that) and starting over to do a corrected comment.
Best to do it the other way around ... FIRST write the corrected comment, check it against the other one, and "publish" it as a comment ... THEN go back and delete the inaccurate one.