Well you have to enable it. Look if there is any button on the router for the wlan. Look carefully though cause some routers have that button a bit camouflaged or in the back of the router. Otherwise log to the router settings and enable it through there. Open a browser enter the router address (usually written in the bottom of the router, something like 192.168.2.1) default name and password must be admin/admin. Look around the menus and find the wlan to enable it.