I am new to this forum also. How do I start a new post?
Click the big orange button that says "Post new topic"
Write message, when done
Hit blue button that says "Post"
If you are trying to answer a post, then you either hit the "Quote" link, or the "Post Reply" button.
If you are trying to post an image, click on the "Camera" Icon, find the image on your computer and upload it or enter the URL for where your image is located.
It is not rocket science, but you need to pay attention to the various icons and text buttons that are displayed.