If you need to do that then you will have to call the Custom Plates Unit at 1-518-402-4838. Their office hours are 8:00am - 4:00pm, Monday through Friday.
How long until I receive the new plates?
The timeline is as follows: In approximately 10 days or less after your order is processed, you will receive new registration documents that show your current plate number and your new plate combination. You should allow at least six weeks for the custom plates to arrive.