I added duck duck go to opera mini on my android phone by doing the following:

1. Click on the drop down menu for search engines.
2. Click manage search engines.
3. Choose an engine you don't use (I chose ebay)
4. In title type duck duck go.
5. in address type "

It works fine for me. The only issue is that the icon is still the ebay icon.
posted by [Old Forum guest] • 7 years and 1 month ago Link