Where's the "vote to close" button?

Question

I was considering voting to close I'm creating an original setting for D&D--where do I start? as a duplicate but there is no 'close' button.

Vote to close takes 250 rep (which I have)

Is it 'cause it's a considerable upvoted question?

Given the activity on that question I think it would be wise to merge it with What qualities are important when creating a fantasy RPG campaign?

Answer 1

Vote to close your own question is 250, vote to close someone else's question is 3000 rep.