Ok I made an account just for this. I installed a different speed dial app to open when I open a new tab. However, when typing into the main hppt: search bar it was still Yahoo, so if you right click on the toolbar (where depends on your computer)> customize> insert search bar> click icon in small search bar> scroll down to google> right click to remove small search bar. This will make the main hppt: search bar google as well.
Hope that makes sense, but I don't know how to take screen shots on my computer.