Inserting code into Contact Form 7

I’m helping a client use the WP Engine to build their website. It’s all pretty user friendly and the client doesn’t have to be a “geek” to modify or update their site. However, they recently added a plug-in called Contact Form 7 which is a pretty basic contact us form. The client wants to modify this contact form with more information since they are using the contact form for their clients to request a quote for specific projects. So, the form and fields need to be updated to represent these various project needs and specific text field to fill in. Initially I used Dreamweaver to build the original Quote Request form and they want to use that same form. How do I transfer the code from Dreamweaver and make that code build the same form in this plug-in using WP Engine?