Once device unboxing is done, you have to proceed with the setup. Setup steps to follow:
Firstly, you need to insert a SIM card in the device in case you desire to use cellular network. Slot to insert the SIM is on the back side of the device. Remove the cover plate first, insert the SIM and close it. Also you can insert the MicroSD card in the given slot. Both the slots are given under the same cover plate. Inserting the MicroSD card is completely optional.
Turn on the power now by pressing the power button on the device. Use a 5V/2A power adapter to charge the device in case the battery is low. You can check the battery status on the device LED.