What is the difference between "Register These" and "Add to Cart"?
Once you have selected domain names that you are interested in purchasing are two options for continuing the registration phase.
This option proceeds straight to the checkout page, allowing you to register only these domains immediately. Any domains you may currently have in your cart will remain there and will not be registered.
Add To Cart
This option allows you to store these domain names in your shopping cart for future purchase. This facility is designed to allow you to continue searching for domains and build up a list of domains for purchase in your cart. When you are satisfied with the selection of domains in your cart you can continue with the registration process.