I would like to insert a Youtube video into my post in Readdy.Net.

All you have to do is enter and save the link from Youtube.

The link can be seen at the top of the Youtube page like: https: //www.youtube.com/watch? V = fJ6HVfI5eYQ

Just click the link and save. then the http-link text is automatically converted to a Youtube video

In the view you can see the Youtube video as embedded video

Like here: