Can some one help how to update the change of address in USCIS website. It is asking some 'A' number and I do not have one. It does not take my i94 number.
The A# is not a required field. You might be a student, visitor or "other". If you want to include a copy of the I-94, use the paper AR-11.
Actually it is enforcing to enter A#. Nevertheless I have taken a printout of the PDF, filled it and sent by certified mail.