1. Connect your linksys Router with LAN cable. (its safe to connect with LAN when you configure - you can do it from wifi too ) 2. Enter in to Router configuration (Generally 192.168.1.1 is the router IP) [i.e. open any browser and enter 192.168.1.1 in address-bar ] 3. password will be default if you haven't changed it (i.e user=admin and pass=admin) 4. Go to wireless setting and there will be all the options. 5. Select security from none (open) to WEP. 6. Enter password for network and 7. Start wifi 8. If it still isn't showing security enabled, just reboot your router which will be last option generally.