For some browsers and operating systems, you may find that you need to grant permission to the Flash plugin before the meeting loads. Otherwise, you will be stuck at the "Connecting" stage.
If this is a requirement for your browser, you may see the puzzle icon in the center of the page.
You should also find the puzzle icon at the upper right, in your address bar. Click there to open a permissions box, where you can grant permission to run the Flash plugin.