Report access rights can be provided per each available Rights Cloud report. 

To provide access to reports for a user role, go to Administration ->Security ->Roles. 

In the Roles screen, select a Role and in the Application Area select Reports. On the right side of the screen, ensure "View" is checked then in the Report Access selection check the specific reports to be allowed against the selected Role. 

The Role will provide access only to the "checked" reports. 

Administration > Security > Roles

For more information about Roles, please reference the following video: