If you reserved your pass through a travel agency outside of Japan or through JR-EAST Train Reservationsite, you will need to pick up the pass at a ticket office or ticket vending machine after arriving in Japan.
This page explains where each type of pass can be picked up.
Passes cannot be picked up at JR Ticket Office(Midori-no-Madoguchi)(excluding Narita Airport and Airport Terminal 2).
However, you can collect seat ticket using tickets and passes reserved through JR-EAST Train Reservation at JR Ticket Office(Midori-no-Madoguchi). Please note, you cannot collect tickets at any stations other than JR lines, such as Izu Kyuko or Fujikyu Railway Line.
To receive seat ticket using the pass, you will need the pass for each person.