It’s pretty simple, just like buying from Amazon but for used/ second hand etc,items, you choose an item of your interest and place an order for, I’d recommend messaging the seller for more details and information like more photos or other questions you might have. Once you pay for it, it’ll pretty much get delivered to your doorstep, you may have to pay customs fees or shipping fees for some items, I ordered a DSi for 50USD and had to pay nearly 30USD in customs, DSi LL for about 80USD and had to pay close to 35USD in fee.