If you have not already read the 'Posting A New Topic' thread, please do so before reading on as I will be using terms first mentioned in the 'Posting A New Topic' thread.

When you are viewing a thread or someone else's post, you can reply by clicking on the button. You will then be taken to a page similar to the 'Post a new topic' page.

Because you are replying to someone else's post, you do not need to enter a subject title. Switch the editor mode to WYSIWYG if you are unfamiliar with HTML or BBCode and type in your reply. When you are finished, click on the button and you will be taken back to the thread where you can view your new reply.

For further information relating to 'Replying To A Post', please reply to this post with your question.