How to prepare/package/send Laptop for Refund?

I sort of impulsively bought this refurbished Y40-70 from newegg.com. Should have done more research before I splurged but after I got it I learned from others and firsthand how crappy the AMD graphics work in this machine in particular. Long story short I want to return it. I've never sent a package in my life, let alone a laptop, and newegg had no info on how to go about doing this other than giving me an RMA number.

Do I just throw it in a box ? And then what do I do with it? USPS or something??? I'm frustrated right now, and I understand this all may be pretty common sense for most of you but any guide on this kind of basic knowledge would go a long way for me right now.

Thanks!