To upload your header image to the blog:
1. Go to section Layout and click on the 'edit' of the Header widget to open it
2. You will see that the demo header is still active, click on 'remove' to get rid of it
3. Upload your header image from your computer
4. Check off the box ‘instead of title and description’
5. Do NOT check off the box ‘shrink to fit’
6. Save the changes