How do I select a Windows slide show image permanently.

[fifehut]

I like the "Edinburgh" image of a few weeks ago and would like to install it as the start-up image.

 

[W Fallon]

https://www.google.com/search?q=select+a+Windows+slide+show+image+permanently.&oq=select+a+Windows+slide+show+image+permanently.&aqs=chrome..69i57j69i60&sourceid=chrome&ie=UTF-8

Bill