ending CPP on self-employment

[LJE58]

I understand that to end contributing to CPP I need to fill out Schedule 8, part 1.  

I have been told that I should have done this for 2023 tax year, in order to have it applied to the 2024 year. But my husband and I both had our birthdays near the Christmas/New Year holidays; so we are okay with having this start in January 2024.  

In Part 2 there is automatically 12 entered for the number of months that CPP applies to 2024.  I would have to override to change it to 1, and not be able to NetFile.

In part 4 the calculations are for the full 12 months, and that is not correct.

I do not want to send CRA the amount that shows up owing on our T1 General, because getting a refund from them is next to impossible.  

Question:  Where do I make changes so that the Schedule only calculates for 1 month, not 12?

I don't know if this is a glitch or if I need to enter information on another page