To delete applications obtained from the Apple App store

You can use Launchpad to delete applications that were downloaded from Apple App Store. To do this: 

1. To open Launchpad, click it in the Dock or open it from your Applications folder

2. If you can't see the app in Launchpad, try one of the following options:

a. click on the magnifying glass icon and type its name in the Search field at the top of the screen.

b. swipe right or left with two fingers on your trackpad to show the next or previous page

3. Press and hold the Option (⌥) key, or click and hold any app until the apps start jiggling

4. Click the Delete button (an X at the top left of the icon) next to the app you want to remove, then click Delete to confirm. The app will be deleted immediately.

Apps that don't have a Delete button either didn't come from the App Store or are required by your Mac. To delete an app that didn't come from the App Store, use the Finder instead.

Using Finder to delete an application

1. Locate the app in the Finder. Most apps can be found in your Applications folder: open it by clicking Applications in the sidebar of any Finder window.

Or use Spotlight to find the app, then press and hold the Command (⌘) key while double-clicking the app in Spotlight.

2. Check if there is an uninstall option associated with the application:

• If there is, use this method to uninstall the application. This will ensure that any additional files associated with the application are also deleted. 
• If there is no 'uninstall' option, drag the app to the Bin, or select the app and choose 'File' and then 'Move to Bin'

4. If you’re asked for a username and password, enter the username and password for an administrator account on your Mac. This is probably the username and password you use to log in to your Mac.

5. To completely remove and delete the application, chose one of the following options:

a. choose 'Finder' and then 'Empty Bin'

b. right-click on the bin icon in doc and select the option 'Empty bin'

On older version of the Mac operating system, the Bin application may be called 'Trash'.

Useful links

How to upgrade a Mac Operating System