To add an ingredient to the database, copy the fields from the food's packaging into fields on this screen. You can immediately use your ingredient in a recipe, including the one that's currently open.

If monounsaturated and polyunsaturated fats are not listed, a tool is available to estimate them. It basically assumes there is an equal amount of mono- and poly- fats, subtracts saturated fat from total fat, and divides the remainder by two.