Q: How do I use this service to pay for your products? A: All you need to do is click on the "Yahoo PayDirect button". After you do this a small window will popup with a secure "128bit" connection that will show the items in your shopping cart.
Q: After I've added all my items to the shopping cart, how to I pay for them? A: Click checkout, where you will be prompted to enter either a credit card # or just simply use your exsisting paypal account, and click submit and your done.
Q: Do I have to have Yahoo PayDirect account in order to use this? A: Not at all, all you need is a credit card.
Q: How will I know my order went through? A: After you checkout a email will be sent to the one your required to provide, confirming that your order was received and is being processed.
For more details on how to use paypal, check out their site.