Go to PTCAS > Supporting Information > Observation Hours > add observation hours
Hours will be what you calculated. The PT is NOT expected to put in your hours for you. Their job is to verify the hours you calculate and submit on PTCAS. Many programs do not accept hours that are not verified by a PT.
They have a form you can use but the easiest way is to ask for their (the PT's) email and input that into PTCAS at the very bottom of the "Add Observation Hours" tab. Then, PTCAS will send them an email to verify the hours and will be verified immediately upon completion.