Step 1: Open a product page, click the "Add to cart" button
Step 2: Then click the "View cart" button, and click the "Check out" button
Step 3: Fill in the shipping information
Step 4: Click the "Continue to shipping" button;
Step 5: Click the "Continue to payment" button;
Step 6: Choose the payment method ( you can choose "Credit Card" or "Paypal"), then click "Pay now" button;
Step 7: Login in your Paypal, and then Complete payment.
