1. Click "Register" on top right corner on website page, becomes the formal member of this website. (the registered users, can click the "sign in" directly, and then load the website.)

2. Through "Search" or "All Products" to find the subject which you needed,click the button "Add to cart", and add the Q&A to the cart.

3. After confirmed the Q&A you needed in the shopping cart, click "Pay Now" payment purchase. (use PayPal account or credit card such as Visa, MasterCard, American Express, Discover Card and JCB to purchase directly.)

4. The page will change to PayPal platform automatically, we will not charge you any use card information.

5. The purchase complete, we affirmed your payment, Through your register mailbox, we will send the Q&A to you in 12 hours.