Open the Add Photos tool from the Event Dashboard of the event.
Uploading and tagging
Drag and drop your photos into the first section. A preview appears at the bottom. From the preview you can add bib numbers to tag racers, and write a caption for each photo. Both are optional, though bib numbers are what let participants find themselves.
Watermarking
The second section lets you add an optional watermark, which stops participants downloading pictures directly from the event page.
Photos for sale
The third section takes a link, if you want to send participants to photos being sold from the event.
Publishing
Select Publish Photos in the top right. This automatically notifies everyone who took part that photos have been uploaded and gives them a link to view them.