If you don't have Opera and would like to try it out, you can download it from the Opera Website.
Open the "Easy Setup" menu
In the top right corner of the Opera window, you'll see the "Easy Setup" button. Click it to display the basic Opera settings menu.
Scroll to the very bottom of the Easy Setup menu
Now that you've opened the Easy Setup menu, you need to scroll to the very bottom of it.
At the very bottom, you'll see a link called "Go to browser settings".
On the Settings screen that has now appeared, you'll see a "Search settings" input box (possibly behind the Easy Setup menu that you just clicked on).
Click "Site Settings"
Scroll down and find the Site Settings option and then click it.