Unfortunately, You cannot change or add anything on the return that you just
e-filed. It is too late, just like when you put an envelope in a US
mailbox
Now you have to wait until the IRS either
rejects or accepts your return. If your return is rejected, you will be
able to go into your account and make the necessary changes to your
income and re-submit your return.
If the IRS accepts your return, however, then you have to wait
longer until it has been fully processed and you have received your
refund. THEN you can prepare an amended tax return and mail it in. You
will be needing to use a form called a 1040X, which becomes available in
mid-February. You cannot e-file an amended return. They have to be
mailed, and it takes at least 2-3 months for the IRS to process an
amended return. Meanwhile, DO NOT go in and start changing anything on
your return in the system, or you will make a mess for yourself. Sit
tight and wait until you see what the IRS does with the return you just
e-filed