To edit an event that you submitted previously, Sign In, and go to the calendar. You will see a red Edit Button next to events that you previously submitted. Clink on that button, and you will be able to edit the event, including adding regatta forms or results.
If you are not a C420 member, but would just like to add a regatta, Sign Up for an account just for this purpose. You will then be able to login at a later time to add more information.
Note: Any event submitted will need to be approved by a Club 420 administrator, before it displays in the calendar. If you do not see your event on the calendar within a few days, contact firstname.lastname@example.org.