Start with Adobe's Flash Player Help page which details how to Enable and Test whether Flash Player is installed and working on your computer.
Enable Flash Player under Settings. Click here for a link to the instructions.
Mac instructions are at the top of the page and Windows instructions are down the page.
After you click on “Allow sites to run Flash” then click on Done and they will run.
Windows 10 Edge:
When you click on a video you will be prompted to run Flash Player. See below: