You can use the filter tools on this page to find the relevant race or races to add to a race series. For convenience the view defaults to races recorded in the last two weeks but you can easily search for races over a different time period.
You can search for the race's name, the class of boat competing in a race or or pick a specific date or time frame to refine results.
Once you have found the relevant race or races, select those you wish to add to the series via each race's check box and click selected at the bottom of the page.
important: once you have added races to a series you must re-score that series (as provisional or final) to include the races you have added in the series results.