Blueglass explained them very well Summerstorm, is that how you apply for a 1-piece appliance?
I couldn't find a video, either. But, the website for the company has a ''how to apply'' pictoral. I will post the addy for both. For the pictoral, you have to start with #1 and follow the arrows around clockwise. It took me a while to figure that out [it's Monday].
I really, really like them and use the larger square one. Opsite Flexifix tape will do the same thing, but you have to ''picture frame'' the wafer yourself with 4 strips. Sure Seals fit perfectly over the wafer with one application and they look much neater.