How does one remove a thread question once he has gotten the answer?

You don't. Your question remains so that other people searching the site might benefit from the answer as well. That's what makes the search feature on this site so valuable - years and years of questions and answers.

If it(the question) was a mistake, in poor taste, offensive, or a duplicate, pm me, and I will get it taken care of.

Will

Your newbie like buffoonery is forever emblazoned in the minds and browser caches of the membership! jk