I'm not sure which mobile application you have but I use the iphone and when you pull the app up there is a button on the main page (at least on the iphone) to track food, scan barcode or track fitness. When you press the "scan barcode" button your phone will automatically look as though it is taking a picture. Simply focus your phone on the barcode and will walk you through from there.
"We either make ourselves happy or miserable. The amount of work is the same." Carlos Castaneda
Live Kind. Laugh Often. Love Always.