https://addons.opera.com/en/extensions/details/duckduckgo-for-opera-2/?display=en
I have found the extensions are a bit tricky to install in Opera, maybe it is the new version. If you click on install and it generates an error, I have found right clicking and “opening in new tab” gets around the error. After that, go back to the extensions menu item and “install” duckduckgo.
After it is installed, the “Duck” will show up to the right of the address bar, click on it and search.
I have Duck in my toolbar and on my Speed Dial page. The problem is that dang Google search box across the top of the Speed Dial page. I want it gone!