Nutrition Tracker

I've started using this feature and find really helpful. Question, how do I get a food item into the "Frequent" category. I see some of my foods there that I've created, and also some "ready" foods but don't know how they got there or how to add a ready food. I can browse for a food item and add it to the days total but can't add it to "Frequent".  I used the custom feature to store a sport bar but of course, it's not custom. Thanks