If your access rights are based on the Roles system (Business User, Analyst, Advanced Analyst and Customised) then all users belonging to a group where the role is "Advanced Analyst" will have access to this interface.
It is also possible to add a right to Data Manager in a customised role.
If you're still using our old access rights system, only the admin will have access to Data Manager by default. However, the administrators can give access to other users from Analyzer NX.