Upsell Code to work with 1shoppingcart

I need to install some code to work with 1shoppingcart for my upsell process. PROCESS: Customer purchases DVD, sale is completed with 1shopping cart, then sent back to my "customize order page" where they are asked to purchase product#2 (upsell). I need some code installed at this point that will grab details of previous order from 1shoppingcart and email me when user chooses to make second (and third and fourth) purchase. (so I can manually add the order to their account) I already have the code, just have no idea how to install it on my website. Will give access to whatever you need. Also, I'll need you to provide simple instruction on how to complete this task myself for future projects. I'm sure this project is not difficult, I just can't figure it out, there's something I'm missing. ## Deliverables I've enclosed the document, with instruction on how to set this thing up. I have permission to use it, I just need your help in installing it and providing me with basic instruction on what steps you did.