The "Buy" option is a rapid purchase option available in the Great Emporium. It's very practical, as it will allow you to get the item you want in just a few clicks, without having to go through the shopping cart.
Here's what to do to get access to use this option:
1. Click on the "Buy" icon of the item that interests you.
2. Click on the "Confirm" button to validate the purchase and debit your Ogrines.
3. Now the only thing left to do is assign your items from the "Items / Gifts" interface.