If you no longer wish to use an established link because, for example, you have switched from iCloud to Google Apps, then you can always disconnect this link.
- Navigate to your icon user in the top right corner and click on “Integrations”
- Click on “Explore” on top of your screen
- Search for the application that you want to deactivate
- Click on the application and click on “Manage”
- Click on the slider to turn off the application