Well you were supposed to put ALL your income on the ONE tax return you file per year ... if you have already filed and did not put all the income on it AND it was accepted then you will need to AMEND the return AFTER the first return has been fully processed and you have the original refund in hand.
https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
