Settings – Tap “Safari” 
Tap “Search Engine” on the top.
*Default Search Engine is set as Google
You have 4 options to choose.
Google, Yahoo, Bing, DuckDuckGo.
Choose your own favorite.
I selected Yahoo. Let’s try it out!
Type anything in the URL(Where you type websites address) and Tap “GO“
Well Done!
The results are from Yahoo.