When I first saw the question, "Do you want the www in your URL?" I thought "Leave it alone; Both http://www.example.com/ and http://example.com/ will work" would be the best option.
Then I read "WordPress is unique in that it requires the URL to either force www or remove www from the domain name." After reading the entire section about this issue, I am still very confused about what I should choose.
It sounds like I have to choose either "add www" or "remove www." (If I have to choose, I prefer remove.) But have I understood this properly?