You start off in the Diary (the start page in the app). Click on "+" and choose the type of the meal you want to track (Breakfast, Lunch etc.). On the next page the icon for the barcode scanner shows up.
Click on the barcode scanner icon on the left side under the search field. Scan a barcode. Done!
In case there is not enough light, please click on the little flash icon in order to activate the light of the phone.
Choose the barcode symbol in the upper left part of the page. Scan a barcode. Done!
Make sure that the camera is not too near to the code you want to scan and there is enough light. In order t active the auto-focus of the camera, please