Once the tax return has been filed it cannot be changed.
A state tax refund cannot be used pay federal taxes owed.
You will have to amend the state tax return if you want to change how the state refund is applied.
See this TurboTax support FAQ for amending a state tax return - https://ttlc.intuit.com/community/amending/help/i-need-to-amend-my-state-return/00/26510
