Dom, I have figured it out.
1- Click on the green box "PLACE AN AD". You will see a dropdown box that reads "For Sale" - DON'T TOUCH IT!
Click on "Submit"
You will see another dropdown box - click on the arrow and locate SOVIET MILITARIA WANTED. Add your description, your photos (if applicable) and you are all set.
..and thats that.
PS I have posted a TEST ad, and it works A-OK. I will leave it up for twenty four hours.