First: Click the product you like, then add them to your shopping card. If you want to buy more then one different items, you can click continue to pick up another items and add them to your shopping card, if you want to buy more then one same items, just fill in the quantity of the items you want to buy and click update, That is ok.

Second:  When you add all products you like to your shopping card, click Pay then you will see a blank, pls fill in all the information, then click submit, then click buy now, then you will see the payment information blank. fill in all information to finish your order.