Can't make Brave search engine my default home page

I’m not talking about a bookmark. In Firefox, there is a “Search” field in the address bar. I was able to set Brave as the default search engine there. (Although it keeps running me in a circle saying I’m not signed in.) What I’m talking about is the homepage on my browser. Currently, my homepage is DuckDuckGo. So that’s what I’m using for all my searches. To use Brave’s search engine, I need to be able to set that as my default homepage. But I haven’t figured out how to do that yet.