Hey there man. If you're trying to start a new thread, all you have to do is click on the section you want your thread and in the upper left corner of each sub forum is a blue button that says "New Thread." Click on that and start your thread. To just reply to someone else in their thread, just scroll down to the bottom of the page and in the reply box, you can leave your question/comment. Hope this helps and if you need anything else, feel free to ask!