But, How do I remove it permanently?
Resort and it is not there, until it comes again!
I have searched for several words on the screen, but no good!
And I have reinstalled macOS
I assume this is in Safari? If so, clear all history and cookies, quit Safari, the relaunch it. You can download with another browser if you have one, then install and run Malwarebytes for Mac also.
If not in Safari, look in > System Preferences and see if there is an icon called Profiles. If so, see f there are any in there and let us know.
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