To delete an existing athlete, click on Athletes from the Main Menu Bar, highlight the Athlete in the Athlete Browser and click on the Delete icon 
. MM will ask for confirmation and then delete that athlete and all of his/her entries from your Database. Relays will not be deleted, but this athlete's name will be removed if listed on a relay.
Please note, once an athlete is deleted, it is NOT reversible without re-keying the information !