Don't attempt to insert the SIM card while the device is powered on. Doing so may harm the SIM card and/or the device.
Ensure that the device is powered off.
From the top edge of the device (display facing up), remove the card tray.
Utilize the insertion/removal tool to unlock the tray by inserting it into the provided slot (figure 1) then remove the tray (figure 2).
With the gold contacts facing down and the notch located in the lower-right, insert the SIM card into the tray as shown.
Ensure that the card fits into place.
Insert the card tray.
Press in on the tray to lock it into place.