If you purchased the Premium Service via the Apple In-App Purchase (IAP) mechanism, then, subject to applicable law, you may only cancel your Premium Service membership through Apple.
How do I cancel my Premium membership if I ordered through Morningstar app?
Should I sell my fund if it got downgraded?
How do I compare investments across investment universes?
What’s the difference between Morningstar Basic and Morningstar Premium?
How do I update my profile information?
Where can I find help for Portfolio Manager?
I forgot my password. How do I reset it?