1. Visit the website youtube.com and find a video you want to insert.
2. Then, after the video appeared press the share button.
3. Then click on the embed code below. copy the code.
4. Log in to the blog. Then click on the new post. After that select edit html, paste embedded code.
5. Then click publish post to see the results. The video size can be changed by making modify the
code above. best of luck
