|On your wireless laptop, look at the list of available wireless networks. Find yours in the list and it will say either "Security Enabled" or "Unsecured". Unsecured means no password has been set for that network so anyone within range can access it.|
Alternatively, log in to your router's configuration web-page and look in the "Wireless" section. It will show the wireless WEP/WPA access key if one has been set.
My Netgear router (which I no longer use) came with a wireless WPA key already set at the factory I think, but you can change it to one of your own making for better security.
Whenever changing any wireless settings on your router you must use a wired connection to do so.