How Can I include the Quebec tax withheld and QPP deductions for my returns reassessment ? what line numbers i need to add these details on the reassessment ? Pls advise

I lived/worked in QC and later moved/working in Ontario in 2021. I missed to add RL-1 details on my 2021 returns. Now i want to apply for reassessment with correct details from CRA "My Account"