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You should now see a window showing a selection of different desktop wallpapers, with a check next to your current wallpaper.
You can also just right-click on the desktop, select Personalize, then click Desktop Background near the bottom of the window.
Open the Windows control panel (you can access it though the Start menu, or by searching for it from the Windows 8 Start screen), click Appearance and Personalization, then click the “Change Desktop background” link. Just select two or more images to start shuffling your Windows desktop wallpaper. Do you use different Mission Control desktops on your Mac? If so, you can set specific wallpaper settings for your individual desktops-meaning, for example, you could have Desktop 1 set to just a single background, while Desktop 2 shuffles through different wallpaper images every five minutes. Want your Mac to shuffle your wallpaper rather than just flip through them in order? Check the “Random order” option. Select a time interval, anything from every five seconds (which could get a little dizzying) to once a day. Pick a photo folder from the left-hand column (if you don’t see the one you want, click the little “+” button), then check the “Change picture” box at near the bottom of the window. Or, here’s an easier way to get to your wallpaper settings: just right-click on the desktop, then select “Change Desktop Background” from the menu. Click the Apple menu in the top-left corner of the screen, select System Preferences, click the Desktop & Screen Saver icon, then make sure the Desktop tab is selected.