How to add thumbnails easily to bloggers' website videos?

How to add a video thumbnail to a blogger website is shown below: 

Follow the below steps.

overview:   

1. go to your blog site & open your post.
2. click left <> icon & go to HTML view.
3. Click insert image icon & Upload Image From Your computer.
4. Copy this Script without bracket (     style="display:none"      )
5. An HTML code has been generated for the image you uploaded a while ago. At the end of that cord is the JPG or PING format of the image. Go there and paste the copied This code style="display:none" after the image format and before the /></a></div>.
6. Then update your post  & finish .

Explained in more detail with screenshots below for easier understanding

•   go to your website & open your post                                     

•       click left <> icon & go to HTML view.                                                                                                   
• 

•     Click insert image icon & Upload Image From Your computer.                                                          
• 

• Copy this Script without bracket (     style="display:none"      )

• An HTML code has been generated for the image you uploaded a while ago. At the end of that cord is the JPG or PING format of the image. Go there and paste the copied This code style="display:none" after the image format and before the /></a></div>.

•   updte & finish