With screen facing down, remove the card tray (located on the upper-right edge).
Utilize the insertion/removal tool to unlock the tray by inserting it into the provided slot then remove the tray.
With the gold contacts facing up and the notch located in the lower right, insert the SIM card into the tray then insert the card tray.
Ensure the card is properly seated in the tray with the front of the card under the notch and gold contacts facing up.
Press in on the tray to lock it into place.