More information

1.  In the WYSIWIG editor click on the add media icons.

Like this:

Te Whare Tapa Wha.wmv

I inserted a short video I made. It uses a WMV format. (Windows media video). It shows as a link which the user clicks. 

2. YouTube video

Click the share link in YouTube when you  find the video you want. 

Copy the link and add it your page, book, summary. 

3. Embed YouTube videos. 

Click embed then copy the link like this.

Click the code icon (first click the extend icon)

Then paste the code. Save changes.