You can export your swims to Strava by using logging in to Swim.com on a web browser (www.swim.com).
1) Log in to your swim.com account and select the swim from your list of swims that you wish to export to Strava.
2) Hover over the "configuration" gear icon located at the top right of the page (above the listed swim facility linked to your swim and to the right of the social share links) and select "export FIT" and save the file locally to your machine.
3) Open a new tab or window on your web browser and log in to your Strava account
4) Navigate to http://www.strava.com/upload/select to upload the .fit file to your Strava account.