Navigate to the Forums Page and click on the forum that you want to post in. Then at the top right there is a button titled "Post New Thread", just click on this and it will take you to this screen below: Add in your title to your thread ie; "Hello I'm new". Then type into the box underneath. When you are done with your message and want to post it, click on the "Create Thread" button just below. This will create a basic thread with no polls or pictures.