How do I get rid of browser hijackers?
I have two problems. 1.No matter what I do, Safari always places and Amazon website on my browser. I have smithed from Safari to Bing. I've changed my home page in system preferences. I always get that stupid Amazon page. I called Amazon and they told me it was Apple's fault. 2 I cannot use my Bookmarks>Favorites panel because someone has placed Quick Email Access on my computer. How do I get rid of the person doing this and get these things off of my MacBook Pro, Mojave (updated today, Apr, 13, 2019?
Thanks for any help.
MacBook Pro 15", macOS 10.14