How to reply to a question.
Just a heads-up for newcomers. When you ask a question, the person who answers should hit the reply button on your question. His reply will then indent under your post.
If you then want to reply to him, then hit your own reply button and your answer will appear under his.
When ever you want to reply to someone in a long stream of answers, the best you can do is move your eye upwards to the first time you see the word reply, and click there. Your own reply will then appear at the end of the list of replies.
It took me a while.