It's not enabled by default yet (will be soon), but we can enable it for you. If you have a support contract I recommend that you just create a support ticket, if not just let me know and I can help with it. I'll send you a DM, so we can discuss the details
Update: The trial signup period have ended and we can no longer enable APM UI for new users on 6.2. When 6.3 is released the APM UI will be enabled for everybody.