Hello and welcome to Apple Support Communities, donaldfromaberdeen.
If I understand your post correctly, you're trying to completely uninstall an app and have been unable to get rid of the app icon. I'd like to help.
Check out the developer's steps to uninstall it here:
McAfee KB - How to install or uninstall McAfee Internet Security for Mac (TS101226)
Solution 2
Follow these steps to uninstall McAfee Internet Security:
- In the Dock, find and open the Applications folder.
- Double-click the McAfee Internet Security Uninstaller.
- Click Continue.
- Type in your administrator password and click OK.
- Click Finish.
NOTE: By default, the option to uninstall SiteAdvisor is not selected. If you want to remove this browser add-on, select the check box beside Uninstall SiteAdvisor in Step 2.
Note that if you've removed the folder that includes this uninstaller, you may need to download or reinstall it again to have this uninstaller available.
Let us know if that resolves this issue for you.
Thanks for using the Apple Support Communities. Take care.