At the beginning page of any section, Take for instance "1987-1996"
http://www.f150forum.com/f10/
Look for an icon "New Topic" at upper left on page. Click on that icon...and away you go!
Enter your "Title" to discuss.
Write in "Content field" just below that.
When ready to post it...Click submit New Thread".
To Preview your post, before actually posting it, click "Preview Post".
If it look's good, then click "Submit New Post".
After you "Submit New Post", when you view your post , you will see an "Edit" icon on that post, should you want to make changes or corrections after your submitted that post.