Flashplayer

If you have Windows 10 Creators Update (OS Version 1703), Microsoft implements Flash click-to-play, by default, on a per-site basis.  Microsoft does NOT provide the ability to enable Flash Player on all sites.  More information is available at https://blogs.windows.com/msedgedev/2016/12/14/edge-flash-click-run.

1. Look in the address field for the puzzle piece:
   
2. If the puzzle piece is visible, click on it to display the ‘Adobe Flash content was blocked’ message with the option to ‘Allow once’ or ‘Always allow’:
   
3. Select either ‘Allow once’ or ‘Always allow’. Recall that this is on a per-site basis. Allowing it for this site will not allow it for any other site
4. If the puzzle piece is not visible on the page, look for a ‘Download Flash’ or ‘Enable Flash’ link/button, or similar text, link, or button on the page.  Clicking on the text, link, or button will display the ‘Adobe Flash content was blocked’ window, from step 2.

<edited:  adding screenshot for step 1>