You can install and manage your Support app integrations from the Zendesk My Apps page.
To access the My Apps page
In Admin Center, click the Apps and integrations icon () in the sidebar, then select Apps > Zendesk Support apps.
The My Apps page appears, showing your currently installed apps.
On the Currently Installed tab you can see enabled and disabled apps.
On the Private Apps tab you can see private apps that are ready to be installed.
Managing your installed apps explains how to work with your apps.