Open Finder
Go to the Applications folder
Locate the app you want to remove
Drag the app to the Trash
Empty the Trash
If the app has an uninstaller, open it and follow the prompts
If the app is from the App Store, open Launchpad
Press and hold the app icon until it jiggles
Click the X button if it appears
Remove leftover files from Library folders if needed
Check Application Support, Preferences, and Caches folders for related files
Delete any remaining app files
Empty the Trash again