The Prison Music Kiosk catalog is only available inside U.S. correctional facilities. The outside population can not access it, so, therefore, you’ll have to ask your loved one to check it out for you. There is no way for the outside world to access the Kiosk database.
UPDATE (8-01-2017): There is now a link available online to check if your release has been successfully added to the Prison Music Kiosk database. Please read the step-by-step manual for more details.