You use Firefox don't you Jacqui? On mine, I click on the 3 horizontal lines on the top right on the menu bar which brings up a number of things including 'options'. Click on that and a new window will open up. Third from the left on the top of the window is 'Search'. Click on it and you will see 'choose a default search engine'. From the drop down menu you can choose Google, click on okay and it should change. Hope this helps.

Paula x