When McAfee detects items that it is not able to handle automatically, the alert shows the number of detected items that require your attention. When you see this alert, you can click View scan report to see the list of detected items, which appears at the end of the scan.
McAfee prompts you with options to handle each detected item. The available options depend on the threat type. For example, for potentially unwanted programs, you can decide whether to quarantine or trust them. To learn about running a scan, read Using scans.