How do you set what time of day McAfee Security Scan Plus scans?

Question

McAfee Security Scan Plus (can't tell the version, "About McAfee" directs me here) says on its settings page "Decide how often and when you want to scan", then provides only a drop-down saying "Every week", "Every other week", "Every month". How do I tell it to scan at 6am? It looks to me as if there is no way.