How to Disable McAfee (with Pictures) - wikiHow Aug 17, 2022 · To do so: Click the lock icon. Enter your administrator password and click OK. Click the Real-Time Scanning switch in the top-right corner. Close the Real-Time Scanning window. 7 Click the gear icon again, then click Firewall. The Firewall tab is just below the Real-Time Scanning option. 8 Disable McAfee's Firewall.