Hi perryco78,
Let me help you.
Bing desktop background will automatically grab a new high-resolution image from Bing and set it as your desktop wallpaper. However, you’ll need to download the official Bing Wallpaper application from Microsoft’s website:
https://www.microsoft.com/en-us/bing/bing-wallp...
Once the app is installed, it will automatically fetch and set a new desktop wallpaper for you.
In addition, the app will launch when you start your computer and automatically download and set a new desktop wallpaper image every day. To change your wallpaper, find the Bing icon in your notification area (system tray), click it, and use the "Next or Previous” options. You can quickly cycle through a few available wallpapers.
Unfortunately, if you are looking to manually change the background of your choice, to my knowledge, I'm afraid this isn't supported yet.
I hope this helps. Please feel free to send a reply if you need further assistance.