Line 17 is for taxes withheld from W-2's and Form 1099's
Go back through the Wages and Income section for W-2's and Form 1099's. You can look at the W-2's you entered and change any amount of taxes withheld if they are in error.
Look at the section for entering a Form 1099-R if you entered a Form 1099-R and change any amounts entered.
