Do you mean start a new thread with a new topic? First go to this page and decide which section of the forum you would like: http://www.backyardchickens.com/f/
Then click on the name of the section of the forum in blue on the right, like "Raising Baby Chicks." That will bring you to that section and at the top in a blue rectangle is "Start a New Thread." Click there.
But if you happen to be in the section where you want to start a new thread, like here in "Pictures and Stories," then go to the top left under the red name of this thread and click "Start a new thread."
Thank you so much..... Rae