You can find Finder on your Dock.
On the left-hand side of Finder, click Applications.
Not all applications have a folder, but if your application does it may contain an uninstaller. Open this folder.
If an uninstaller is in this folder, double click it. This will start the process of uninstalling.
Redditor Finndersen found a cool retro-looking portable television in a dumpster, completely refurbished it, and turned it into a retro gaming powerhouse for his RetroPie build.