Let's try this with an example of a blog post. Log in to your User Panel and go to 'Pages'.
Look down, you can see green button 'Add' - move the cursor on it and choose to create new 'Add Blog Post'.
In Add Blog Post, fulfill boxes and click on 'Open Visual Editor'.
When you click on Open Visual Editor, you will see '+ Add New Section', if you move your cursor on it 3 boxes will come up (Add Text, Add Image, Add Video)
Click on 'Add Video' and paste the link to video you want to add. Save by clicking 'Add Video'.
Mark, all the content you add here will be autosaved.