How do I close Live Wallpaper

I downloaded and installed an app called Live Wallpaper. It puts a clock/date/weather widget on your desktop. Now I want to uninstall it or remove it. Tried dragging the app to the Trash. Said I can't because it's open. How do I close it? Thanks.

Check their support first to see if they have uninstall instructions. But it's likely that the items on the desktop are being placed there automatically upon startup. Check your login items in System Preferences, Users & Groups. If it's there, remove it, restart your Mac and then remove the app.