This is particularly useful for races, clubs and other technology partners who need to keep accurate information over a period of time, or are feeding other important databases and applications.
NOTE: This must be turned on by the Race/Club Director to allow runners to make changes. This is done in the Club Info -> Membership Management section for clubs. For races, you can find this in the Customize -> Participant Management Settings.
Runners can simply do this by going to their Profile Page, selecting the race or club they are a part of and click on Edit. Race Directors have easy access thru the Participant Reports.