> No, that is not how you change search engines.

See it from the perspective of a non-technical user:

1. I install the Yahoo Search app

2. When I want to search I poke the Yahoo icon on my home screen.

Or:

1. I open my browser.

2. I poke Yahoo on the grid of suggested sites.

Sure, there's more than one way to skin a cat.

There are lots of non-technical users who navigate purely by doing a "google search" on whatever domain they're aiming for, too. Nobody said they were efficient about it.