To post ads, you must first pass a test. This is an easy test: send your complete contact information (name, company name, phone, email, physical address) and briefly and clearly why you want to use this site, using this CONTACT link.
If you ask "how do I register to use the site?" or do not send all the above information, you have flunked the test. Your message will be ignored and deleted.
At least 50% of people fail this test, which is astonishing.