Retrieve embed code from a youtube video.
1. Go you the youtube video that you want to embed
2. Go to Share > Embeded
3. Choose the video size
4.. Copy the iframe code
* You can uncheck the "Show suggested videos when the video finishes", so the video will show suggested videos when the video finishes.
How to embed video on the blog posts or pages
1. Change the page/post editor to the "Text" Editor mode.
This step is very important, because the video will not show up if the code is embed on the visual mode.
2. Paste the embed code on the post/page
3. Click "Publish"