Alan
To start a new thread first chose the board that covers the type of thread you want to start i.e. Birmingham Chat, Birmingham History & Memories, General Chat, etc. Open that board and up near the top of the list of posts on the right you will see a box with the word new topic. Click on that box and it will open a new page, where it says subject type in a title for your new thread. Then underneath in the text box type in what you want to say. When complete just click post as with any other post.
I hope this is of some help to you, if not just ask what you want to know.
Phil