On the web page here, if you go to the "Enter Food"
section, at the bottom of each meal is an "+Add Item"
option. Click on that and a list of recent food options will appear as well as a search bar at the bottom. To the right of the search bar is a "New Item"
option. Type the name of the Food (ie Mary Casey Chips) in to the search bar then click on the New Item. A pop up will appear asking if you want to add this new item to the database. Click yes then you will be taken to a page where you can enter in all the Nutritional Info for that item.
A little tip,
for all the foods that I've
entered (especially homecooked meals) I call the Brand Name, My Own. That way if I want to find it again I just a search for My Own and all my yummy stuff comes up and I don't have to search through all the Wendy, Subway, McDonalds for my super great really delicious Honey Mustard sauce.
It really is that good