ForeFlight does not show all Instrument Approach Procedures (IAP) for private airports.
Some circumstances prevent certain instrument procedures from being published in accordance with 14 CFR Part 97. These procedures are referred to as “Special Instrument Procedures” and require specific Aviation Safety Flight Standards Service (AFS) approval for use. (Source: FAA Order 8260.60)
KDZB is an example of a private airport where an IAP exists but is not published in ForeFlight. In this case, the Airports page displays “No Approaches” next to the Procedures line, and none are listed on the Procedures tab.
KDZB’s Special Instrument Procedure cannot be published in ForeFlight
For more information on getting access to and getting approved for using the procedure, contact the Airport Manager. You can find their information on the Airports view by tapping Info > Contacts.
If you do get access to the Special Instrument Procedure, you can import it into the app using the guidance in this article:
How do I add my own plates using the “Bring Your Own Plates” (BYOP) feature?