We are setting up the Supplier Performance Metrics and when we go to Main Menu/Purchasing/Analyze P

We are setting up the Supplier Performance Metrics and when we go to  Main Menu/Purchasing/Analyze Procurement/Review Supplier Performance, with the set ID set properly and the metric as on-time performance, NO suppliers are found. when we change the metric to anything else it gives a message stating "not authorized to this supplier. "  Where do we give authorization to the supplier and add them to the list?