Hi Maria79,
Follow the letter you received. If they ask for a panel physician visit for a specific person, simply make an appointment with the panel physician. They send the application directly to CIC. My dependent child was asked to undergo the medical examination. We did it. It was not difficult and the results and form are sent the same day to CIC. Our panel physician was great and simply advised us to comply with all requests, which we have been doing and things going smoothly. Hope that helps.