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.

1. Navigate to your icon user in the top right-hand corner and click on “Integrations/Marketplace”
2. Search for the application that you want to deactivate
3. Click on the application and click on “Manage”
4. Click on the slider to turn off the application