Hulk Contact Form Builder

I needed to add a field in my Contact Me form for customer photos so they could show me product issues, or show me their review photos featuring my products. I used Hulk apps Form Builder, and it worked well. I was a bit concerned about having to change the code on my Shopify site, so I created a copy first, so if I messed it up, I would still have the original. No problem though, I figured it out and it works great! (More specific instructions on how to change the code would have been helpful. I am a novice website builder, and not a code writer.)