Applies to Dynamics 365 (online), version 9.0
You manage your Dynamics 365 (online) instances from the Dynamics 365 admin center.
Browse to the Office 365 admin center and sign in using Global administrator credentials.
Choose Admin > Dynamics 365
This section provides information on how you add or edit instances of a Dynamics 365 (online) subscription and set up additional non-production (Sandbox) instances.