How do I uninstall an application. It won't let me move it to trash as it says it's open. How do i close it

How do I uninstall an application that I downloaded by mistake? It won't let me move it to trash as it says it's open. How do I close it?

Launch the Activity Monitor in /Utilities and sort by name. Select any that refer to the app (shame you didn't indicate what it was), click on the Quit Process button, and click on Force Quit. When all are gone, empty the trash.

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