But the confirmationreceipt stated, 回複：用confirmation number 就能約

USCIS WILL SCHEDULE YOUR APPOINTMENT to have your biometrics taken at a USCIS Application Support Center
(ASC). ...

• You MUST wait for your biometrics appointment notice prior to going to the ASC for processing.
• This Confirmation Receipt notice is NOT your appointment notice.

Could drop me a line after you have your finger print down?

Thanks a lot.