To use the program you will click on the appropriate icon (you may not see all of these, depending on which applications you've subscribed to):
Clicking the icon will download a file in your browser (e.g. Edge, Chrome, Firefox, etc). Different browsers present this in different ways. Look for the browser to either prompt you with what to do with the file, or it may just save/download to your computer. If prompted, Run or Open the file (see bold sentence below for more info). If you are not prompted, you may need to find the downloaded file in your downloads directory. Look for something like "cpub-Gen[more].rdp".
Helpful Hint (for PC Users): You can save the downloaded RDP (or multiple RDPs if running multiple programs) to your desktop or other easy to find location to launch the program(s).