Create file hello.wbsp and place it in document root of your web server with following content:
Access the file with your web server's URL followed by /hello.wbsp. On your local web server (located on same computer as your browser) the address should be http://localhost/hello.wbsp or http://127.0.0.1/hello.wbsp. If WBSP is installed correctly and the server is configured correctly, your browser should receive something like this:
and it would be displayed like this:
If this example did not output anything when you tried it or if it started the download or displayed the file unchanged (with $wb elements included), then the server probably is not configured properly.