All you need to do Masie is add your comment, thanks, or extra information on the end of whatever has been posted so far under your question. Type in the "Comments Box" then click on "Add comment" just below the box under the right hand corner. It's much easier if you keep all of one subject together.

Thanks for the thanks Maisie - Beattie's right - if you add your responses under your original question, in the Answers box as if you're answering, anyone who's already answered gets a notification that something's been added, and can pick it up.