OK....I'm sort of in the same boat but here goes.
On the main page(where you clicked to post to this thread) there are multiple categories that you can click on.
Under each category there are multiple threads started by our members. If you want to read one of these you would then click on that one and if you want to respond with a comment, after the last response you will see +Reply to thread, click on that and then type in your response. Below the box in which you typed the response there will be a Post quick reply, click on that
Hope this helps
Al