After successfully installing DBMS_CLOUD, you must configure users or roles to be able to use all of its supported functionality.

• Grant Minimal Privileges to a User or Role for DBMS_CLOUD
  For a user or role to use DBMS_CLOUD functionality, you have to grant at least minimal access privileges.
• Configure ACEs for a User or Role to Use DBMS_CLOUD
  To provide all the functionality of DBMS_CLOUD to a user or role, you must enable the appropriate Access Control Entries (ACEs).
• Verify Setup of Users and Roles to Use DBMS_CLOUD
  When user and roles are set up correctly, you can create credentials and access data in the Object Store.