Summarize the following:
You can use any web browser. It's the second link below "Feedback" on the page. By default, your downloaded files can be found in your Downloads folder.  Click the file that says "wnetwatcher_setup.exe".  This opens the Wireless Network Watcher installer.  Follow the on-screen instructions to finish the installation.  Wireless Network Watcher will open when it finishes installing. It has an icon that resembles an eyeball over a wireless router.  To locate it, click the Windows Start menu and type Wiress Network Watcher.  Click the icon to open it. Wireless Network Watcher will automatically scan your network and display a list of connected devices after launching Use the "Device Name" column to see the name of each device connected to the network and the router it's connected to. It's in the upper-left corner of Wireless Network Watcher.  This rescans your network and displays a list of connected devices.

Summary:
Go to http://www.nirsoft.net/utils/wireless_network_watcher.html in a web browser. Scroll down and click Download Wireless Network Watcher with full install. Click the install file and follow the instructions. Open Wireless Network Watcher. Click the 'Play' triangle icon.