What are you trying to correct? Did you enter IRA data as if it were a pension or vice-versa?
In any case, it sounds like you need to delete whatever it is you entered and enter the correct item instead.
Go to Wages & Income-> Retirement Plans and Social Security->IRA, 401(k), Pension Plan Withdrawals (or some variation of this), press Start or Update, then delete the bad entry off the table, and then enter the correct one.
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