To post a response or question to an existing topic (a topic that has already been created), again make sure that you are logged into your own unique account and then click on “FORUM INDEX” on the navigation bar at the top of the page.
In the next window scroll down and then click on the forum that contains the question that you would like to post your reply to and then locate the question that you would like to answer. Some of the more popular forums can receive quite a few new topics per day so you may have to go back a few screens until you locate your desired question.
Once you have found the question you would like to reply to click on it and the details view will open in a new window. Just above the original question details you will notice a button labelled "Post Reply". Click on this and a new window will open allowing you to add the text and images etc of your response.
Once you have added all of the information/images you wish to add and also ensured that the available tick boxes (Disable BBCode etc….) are ticked click on “Submit” and your question will now be posted (subject to moderation)