First, you should create a form using Contact Form 7 plugin, then you can use shortcode to add form into any places you wish.

[contact-form-7 404 "Not Found"]

Pictures

 
1969 Camaro 13 1969 Camaro 16 1969 Camaro 19 1967 Chevelle 10 Plymouth Roadrunner 42 1967 Cougar 1968 Plymouth Roadrunner 1971 Pontiac Formula 400 1960 Buick Convertible 1965 Mustang Coupe- OCD Customs