No. You can not. You will need
to wait and see if your return is Accepted or
Rejected by the IRS. The IRS does not
start accepting returns until January 23, 2017.
If the return is Rejected you can go back
in and fix the mistake without amending. If the return is Accepted you will need to WAIT until you receive your refund and then
Amend your return to add the W-2.
Follow these steps
to amend:
https://ttlc.intuit.com/replies/3288565