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Open Opera browser on your computer.
Click on the opera icon at the top of the browser.
Hover your mouse on the settings tab and select "Preferences."
Preferences dialogue box will appear.
Click on the "Search" tab.
Select the Search Engines you want to to delete and click on the " delete" button.
You may also use your favorite search engine as the default search engine in opera.
To do that. Select your favorite search engine.
Click on Edit button.
Now Click on the Details Button.
Select the check box " Use as Default Search Engine".
Also Select the check box " Use as Speed dial Search Engine" to use google as the speed dial search engine.
Click ok to save the changes.