You will enter that when you prepare the state return. You will come to the screen that says:
Let us know if you made any contributions to either of the following:
The amount you contribute can be deducted from your Pennsylvania taxable income and save you money.
Did you make a 529 contribution in 2023?
Answer Yes and enter the details on the next screen.
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Pennsylvania allows a maximum deduction of $17,000 per beneficiary, per taxpayer for 529 Tuition Account Program contributions made in 2023 to a Pennsylvania 529 Tuition Account Program or another state's 529 College Savings Plan. Rollovers are not considered a contribution, and you are not allowed a deduction for any amounts you rolled over.
Since I am married and filling jointly. I am getting below page. Only Done button for me to complete state return. Not able to get link/page where I can put my PA-529 contribution amount for 2023.