The "Teaches for Programs" selector is an optional classification system which allows filtering to be added to faculty listings to list faculty who teach for specific programs. It is currently being used in a few locations across the site including the PAIA faculty listing. If your faculty listings do not currently use this and you wish to explore enabling this for your faculty, you must first contact firstname.lastname@example.org to establish a plan for tagging all of your faculty.
In Sitefinity, this field is paired with the "Unit and Program Relationships" selector and you will find it located under that heading when editing people listings.
When set up for your, this selector functions similarly to the Unit and Programs selector where you find your program, expand it and select the program(s) that that faculty is affiliated with.