Customization with Modernbill System

I am using the Modernbill system on my site. Need help customizing the Ordering system to better match my site. I can provide a perfect example of what I want. You can view what my current ordering page looks like: [login to view URL] Example of what I want: [login to view URL] and click on the Order Now button. I can also provide full documentation for the Modernbill system. I can only trust this to someone who is familiar with Modernbill or VERY familar with PHP and Linux, etc.