Report untaxed interest

I pay via PAYE and need to tell you about untaxed interest in 23/24. My PAYE page tells me that my tax is being calculated still (it shows all the correct details of pension income already) but I can't see any way of reporting the untaxed interest. There is an option to 'tell us about untaxed interest' on the current year's page though.

Hi

After the tax year end the banks and building societies submit the untaxed interest details to HMRC.
Once received HMRC will review your record and if underpaid or overpaid you will receive a calculation with the details. 

Thank you