回复：You can, I did it.

If I go to another center, do I need to do something in advance or I can just go there and take the fingerprint? I don't think the center has a phone number I can call or consult with. And do I have to be there on the day they specified? I have to drive a long way to Houston, so I hope I won't waste my time taking a long trip without get it done.
Really thanks for your kind reply.