When I first started this website, I was able to answer all the questions that people asked me in the 'comments' area below lessons. However, as more people have found the site, it has become impossible for me to keep doing this; I just don't have enough time to answer every question.
On the positive side, I've noticed that students are now helping each other a lot more in the comments area. Although you might not get a reply from me directly, you might find that another student answers your question.
Please note that I do still read every comment, and you might find the answer to your question in one of the lessons on this page.