You have to become an OCSM (Official Checked Star Members) for that. Please contact webmaster@freeones.com with your details.
Become a member and then you can start a thread for yourself. But you can not post your site link in that thread. You can attach an image on the first post. From next post onward you can post maximum 3 links per 24 hrs. You can participate in any thread wherever you feel your links will not be off-topic.
Best wishes and welcome to the board.