Add an athlete to your Biathle up until you log your first result on your competition day.
You can remove an athlete up until you log your first result on your competition day. If you need to change an athlete's entry, simply remove their erroneous entry and then add them into the competition correctly.
Here you'll find a list of the entered athletes in your Biathle and their email addresses. You can email them individually by simply clicking their email address here or gather all their addresses by clicking the export button at bottom of the page & copying it into your email program.