How to install the SIM card of InRouter305 correctly?

How to install the SIM card of InRouter305 correctly?

InRouter305 uses pop-up card holder. Stab the hollow at the left of the card holder and the card holder will pop up. Then, install the SIM/UIM card and press the card holder back to the card slot.
To prevent damage to the SIM card, please power off the device before installing the SIM card.