How do I correct autofill, which has given me a pension income of $20,000. which I do not get. How do I correct this error.

I was working on TurboTax and halfway through, I saved it and went to bed. When I opened it to resume I noticed that the balance due had increased a lot but so had my stated income! So, I started a new return, because I couldn't figure out how to correct the error. I don't want to continue without correcting the error first. Please advise.