I followed the instructions at the above post, and it adds the search engine. However, it is now in a separate section from the highly censored (and now worthless) search engines like Google, Bing, Yahoo, etc., and the option to make it the default search engine is greyed out.
Does anyone know why or when Opera caved in to the censors or if there is any way for me to decide which search engine I like instead of Opera deciding what's good for me?