1) Go to the Diary view, tap on the '+' button in the bottom right corner, choose a meal. On the next page you see the Favorite section under the search bar. In order to track from there, click on the"+" on the item.
If you would like to edit your food/meals/recipes, tap on Profile and later on Favorites. Click on the item and then on the pen icon top right hand in order to get to the edit mode.