To change your YouTube video thumbnail or add a custom thumbnail all you need to do is:
1. Log onto your YouTube Channel.
2. Select the video you want to change.
3. From the "Basic" tab, select a different thumbnail or click the "Custom thumbnail" box.
4. Save your changes (using Save button, top left)
Learn how to create your very own YouTube Channel:
https://thatsearchthing.com/create-yo...