Once your Certificate of Financial Responsibility requirement is complete and your tuition deposit is paid, your I-20 or DS-2019 will be created. After your I-20 or DS-2019 has been created you will receive an email with an attached copy of the document along with a request to verify preferred mailing address.
If you would like to have your document sent by express mail you will receive instructions. Express mail instructions are also on the CFR. The scanned copy of the I-20 or DS-2019 can be used to pay your SEVIS fee and make an appointment with the U.S. consulate. You should bring the original I-20 or DS-2019 to the visa appointment.