Scan the code on your station's sheet, or type it in. It sets the event and station for you — there is nothing else to configure.
Tap a bib in the grid, or type one below, when there is no QR to scan — a bib written on in marker, or one the camera cannot read. A missed scan breaks every split after it. If you are catching up on an athlete who already went through, set the time they actually passed; stamping it “now” inflates their station time and shortens the next run.