On the under side, it has the default networks information printed. Using this information, you can use the router right out of the box. Just plug it into power and connect its WAN (Internet) port to an Intenet source, such has a broadband modem, and you're set!
There's a label containing the same information on one side and the instruction on how to access its Web interface on the other hidden inside the router's chassis. It'll come in handy when you need to setup or re-set the router.