It is very simple.

1. Click the Classifieds link (top right of the page)
2. Click the "post a Classified" link.
3. Fill in the information on the form.  Be sure to make a selection in all the drop down list.
4. Click the "submit and upload pictures" button.
5. Add pictures to your Ad.
6. Click  the "I'm done......" button and view you Ad.  Edit if necessary.