You can only access the User Management if profile user_management_admin has been assigned at least to one user. Therefore, every Scheer PAS installation is delivered with one standard user management admin.
_dashboard_access_processes: Grants access to the complete process data.
_dashboard_access_transactions: Grants access to the complete transaction data.
BPaaS customers do not need the two additional profiles. But they can use the profile _dashboard_access_processes to grant an administrator access to all processes available in the system for use in Process Mining.