GRANTA MI Pro uses one account to communicate with SQL, this would have been set during installation.
1). Find this username in the Security > Logins node in SQL Management Studio.
2). Double-click the user to open the Properties window.
3). Click the 'User Mapping' page.
4). Tick the required database and place a tick in the 'db_owner' box.
5). Repeat step 4 for each database.
6). Click 'OK'.