|The wireless password you need is in the Wireless Router settings. Look on the back of the router & the factory assigned wireless key may be on a sticker (that key won't work if someone has changed the key though).|
Otherwise, log into the router's configuration web-page and the current wireless key will be shown there. To log on to the router's configuration page, open any web-browser and type either http://192.168.1.1 or http://192.168.0.1 , then press <Enter>.
Make sure the router is fully connected and switched on when you do this.