I see how to comment on questions, but not how to actually ANSWER the question. Can someone point me to what the procedure is to accomplish that?
To answer a question, there will be a box on the bottom of the page that allows you to type in it, under "Your Answer". You can post an answer there!
One limitation: if you are trying to answer a protected question, you will require at least 10 reputation on this site (meaning, you have to have earned at least one up-vote on a question or an answer elsewhere on the site first); that applies only to controversial questions or to limit spam on certain questions that seem to attract it. Those questions will be denoted by a banner near the top of the question.