You don't need a camera to use browser hax. The guide never said you had to use a camera to use bowser hax. It said to visit the specified web page with the browser. GO to your browser, and type the url into the address bar.
Navigate to http://yls8.mtheall.com/3dsbrowserhax_auto.php
You can also load the page by scanning the following QR code (press (L + R) on the home menu, then tap the QR icon on the bottom screen)