Craigslist, e-bay or maybe local newspaper. You might try putting a For Sale sign in the windshield. Hope this helps.
I presume you are trying to post n the classifieds. The APP does not work for the classifieds. Use your phone browser or a PC for the classifieds.
You could also do a legitimate profile, maybe establish some degree of credibility by participating on the website, let folks know your general location or you could just come here to take advantage of the free ads!
simple grammar..... lesson 1. My car is for sale. How do I sell my car? the words sell and sale are NOT interchangeable