How to use a personal picture as background

Solution
Just go to the settings app in the action center, then click personalize, and then background. You can chose individual photos or an entire folder if you want.

Thanks I should have know this works - I have been trying the personalize method every one seems to recommend for Windows 10, but that only allows me to change background colors, not pictures. Thanks again for reminding me of something I have known how to do for decades ! Windows 10 sucks !