Go to the router configuration page and enable the Repeater mode to use your Linksys device as your Wi-Fi extender. Check if this option is available in the Internet Settings menu and follow How to Use Linksys Router as Wifi Extender. If so, specify the connection type as Wireless Repeater. Provide the SSID and switch to the Security mode. Apply the changes done by clicking the OK button. Proceed by clicking the Yes option. Once the setup is complete, check the DHCP table to find the new IP address of your router.