Step 1:
Click 'List for Free' to register or place a listing.  If you're not making a listing then you can just get on with browsing and making enquiries with other listers.

Step 2:
Make a listing if you want (you'll be taken to the listing page immediately after having registered.)

Step 3:
Your listing will go live soon as it has been moderated by Caravan.  Then wait for all your enquiries to come flooding in!