Hello,
We are sorry to say that it’s not the easy work that you are thinking. If you are not a programmer then we don’t recommend customizing the code by yourself. Because it can break the plugin for the wrong customization of codes. If you are a programmer then you could do it yourself without asking us.
However, you need to customize the following files to add a new instructions box and make it works with an order.
http://prntscr.com/1r3xbbd
http://prntscr.com/1r3xh6c
http://prntscr.com/1r3xjem
http://prntscr.com/1r3xoiv
http://prntscr.com/1r3xrcj
Moreover, please learn more about the Envato Market (themeforest) item support policy (item support includes & not includes), here https://codecanyon.net/page/item_support_policy
Best Regards,
ThemeLooks Support Team