My Safari Browser Highjacked
When I saw a pop up window to update my Adobe Flash player I clicked on it. Big Mistake. we know.ac, a browser highjacked was installed on my MacBook Pro. I want to know how to uninstall this highjacked off my computer. It is locked in as the default home page for safari. The Homepage slot is grayed out so I can't change it. I have run malware and have tried to delete this highjacker other ways with no success. My Safari is Version 11.1.2 (13605.3.8). My MacBookPro is a refurbished Mid 2012 running High Sierra OS version 10.13.6. Thanks for any help.
MacBook Pro with Retina display, iOS 11.3.1