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The easiest way to set a specific picture as your back ground is to right click on the picture and then click on Set as desktop background.
 

Change your lock screen picture

1. Open the Start menu and click on Settings.
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2. Click on Personalization.
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3. Click on Lock Screen and choose Windows spotlight from the Background drop down menu for rotating pictures or choose any of the other two options to use your own specific pictures.
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Themes

A theme is a combination of desktop background pictures, window colors, and sounds. New themes can be downloaded from - http://windows.microsoft.com/en-us/windows/themes

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1. Click on the Download theme button
2. Click on Open.
   
3. The theme is now automatically saved to the computer and set as your current theme.

Change your lock screen picture

1. Open the Start menu and click on Settings.
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2. Click on Personalization.
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3. Click on Lock Screen and choose Windows spotlight from the Background drop down menu for rotating pictures or choose any of the other two options to use your own specific pictures.
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