Simple. Register on their web site. You get a dedicated address just for you. They will notify you when items arrive. You can choose to consolidate several items and they will repack into a single box (hence the name), or you can just ask for items to be forwarded as they arrive. They only use Fedex which is probably how they make their margin. There’s a good FAQ on their website. They are just one of several forwarding services that operate out of the US, but Bundlebox is the only one I have experience with. Good luck.