How do I track what I eat, and scan a barcode?

Search the food catalogue or scan the packet, and the day's totals update as you go.

Open Nutrition
Your targets for the day are at the top, and each meal is underneath.
Add food by searching
Search by name. South African products are in the catalogue, so you are not converting somebody else's supermarket.
Or scan the barcode
Use the scanner and point it at the packet. If the product is known, it fills in the nutrition for you.
Set the portion
Change the amount to what you actually ate. Everything is stored in grams underneath, so the totals stay honest across units.

Worth knowing

If a barcode is not recognised, you can still add the food by hand, and the entry is yours from then on.
If you have a coach, your targets may be set by them. If you do not, the app can work them out from your own numbers.