How can I make Brave my default search engine in Opera?

I want Brave as my default search engine in Opera. But, there doesn’t seem to be a way to make it happen. Is it possible? I tried to “add” but, it won’t save. I used the URL: brave.com - is there a different URL? What is the Post? Do I need that? Please advise and thanks in advance!

Since brave search engine is in beta version it only works for the brave browser for now. And the url is search.brave.com .