You will need to check the wireless settings of
the router.
If your network is secured then make sure that you
are typing the correct network key.
also make sure that the DHCP server is enabled on
the router.
is there any computer connected to the router ?
If yes then you can open the router set up page on
that computer.
Router set up page is the page where you can check
all the wireless settings of the router.
Click here for step by step instructions