Hi - I'm happy to help with your Mac issue. Please remember to Accept when we are completely finished and you are satisfied with my answer.
Apparently, BING has been set as your Safari Homepage. It's easy to fix
Navigate to the page you would like to be the starting page every time you start Safari
Then Up on the top Menu Bar you will see Safari in text. Click on it and in the list that drops down, select Preferences
In the middle of the window, you will see Home Page: Just type in the url of the site you want to be the default Home Page.
You can also click on the button that says Set to Current page if you are on the page you want.