Questions covered on this page:
Where can I find the transparent logo file : transparent.png
How do I upload my full width header?
Why do I see a LOGO in front of my full-width header at the top of the blog?
Why do I see SUPER BLOG or my SITE NAME in text over my full-width header?
My full-width header is not showing on my blog, or is only showing on my homepage.
My full-width header is showing up small and in the middle of the header.
Where can I find the transparent logo file: transparent.png
You can download that file by clicking on the file name and then saving to your computer: transparent.png Also shown below - border is added so you can see the where the image is: 
How do I upload my full width header?
Click on Media.
Click Add New.
Click Select Files.
Find you logo in your computer and upload it.
Why do I see a LOGO in front of my full-width header at the top of the blog?
Click on Appearance.
Click Header.
Click Add new image.
Select transparent.png.
Click Select and crop.
Click Skip cropping.
Why do I see SUPER BLOG or my SITE NAME in text over my full-width header?
Click Appearance.
Click Customize.
Click on Site Identity.
Change the name in Site Title to your blog site name.
Click Publish.
Click X to go back.
Click Appearance, click Header. Click Header Image.
Click Add new image.
Select transparent image.
If transparent weren’t in the library, click Upload files and upload it.
Click Select and crop.
Click Skip cropping.
Click Publish.
