How to report after tax IRA rollover to Roth IRA?

It sounds like you completed a back door Roth Conversion.  If you have already entered the non-deductible contribution for 2024, and have been tracking nondeductible basis for contributions prior to 2024, then follow the instructions from How do I enter a backdoor Roth IRA conversion?  to report the conversion.  If you did not yet enter the contributions for 2024, please do that first, in Deductions and Credits > Retirement and Investments.

" Enter the Conversion from a Traditional IRA to a Roth IRA

1. Go to Wages & Income.
2. On the Your income and expenses screen, locate and select the Retirement Plans and Social Security section, then select Start or Revisit next to IRA, 401(k), Pension Plan Withdrawals (1099-R).
3. Answer Yes to Did you get a 1099-R in 2024?, then Continue.

• If you land on the screen Review your 1099-R info select Add Another 1099-R.

1. Select how you want to enter your 1099-R (import or choose Change how I enter my form to either upload it or type it in yourself) and follow the instructions.
2. Answer the questions on the following screens, until you reach Tell us if you moved the money through a rollover or conversion.
3. Select I converted some or all of it to a Roth IRA and Continue.
4. Next, choose Yes, all of this money was converted to a Roth IRA and Continue..
5. Continue answering questions until you come to the screen Review your 1099-R info."

Thanks, more details are in How do I enter a backdoor Roth IRA conversion?