The document provides step-by-step instructions for setting up a TP-Link wireless range extender. It begins by listing the necessary information from the root router, such as the SSID, encryption type, and passphrase. It then guides the user to assign a static IP address to their computer before logging into the range extender interface using the default IP of 192.168.0.254. From there, the instructions direct the user to configure the range extender by selecting range extender mode, connecting to the root network, and matching the root router's security settings. Finally, the extender is rebooted to complete the setup process and expand the wireless network's coverage area.