Hit the "return" or "Enter" button twice, after typing your last word and punctuation in the letter's body. Your cursor should be aligned to the left, with a line between the last word in your letter and the beginning of your signature.
Begin the signature as formally or as personally as you wish. You may type anything such as "Sincerely," "Yours sincerely," "Yours truly," or "Yours very truly."
Hit the "return" or "Enter" button, four times. On the fourth line, type in your professional name.
Sign the letter with a pen above your typed name.