I think you need 2 or 3 different people to "like" your pics or comments to open up your ability to post, this helps us keep spammers from posting spam links or porn
then go to the home page, look down thru the sections and choose a section that best fits your needs .... engine, tires, body, electrical, etc.
after you get your "likes" (I just gave you one) "post new thread" button will appear at the top right of every page page, click it, and post your questions
the only way past that is to do what you did today and post in existing threads that pertain to your questions.