Install app Qrenteerings or QREvented from Google Play (for Android device) or Qrenteerings from Appstore (for iOS device)
Start the app
In app Settings set "Server URL" to https://qrevents.lv
Select Internet event
Enter course code: sample21
Enter your code as "SExxxxxxxx", where "xxxxxxxx" usually is participant's phone number, but for sample event you can use any digits (0-9).
Press Register and you will be ready to enter/scan QR codes for controls on course.