Hello, kaiyuan144. Thank you for posting to the Apple Support Communities. We want to be sure that you can connect with the right support resources to get help with your new iPad purchase.
For the best help with placing an online order, we would suggest that you contact Apple Support directly. Depending on your location, you may be able to request support using the following link:
Get Support
You may also find helpful information at the Apple Shopping Help website here:
Shopping Help - Apple
We hope this information helps you as we know you must be excited for your new iPad. Please let us know if we can help with anything else.
Have a great day!