I just installed Tor and on the page I see a place to type questions into something called DuckDuckGo, but not “tor browser”. Am I missing something?
DuckDuckGo is a search engine just like Google. Like Google, DuckDuckGo crawls the web and indexes it and gives you relevant results when you search using it. Unlike Google, DuckDuckGo does not track your activity. Hence, it is well liked by privacy conscious people, for example people who use tor. So that's why the Tor Browser creators selected it as the default search engine instead of Google.