Seniors and students

Thanks a lot for the explanation. I see similar amount in Box 52 but assuming that it's the employer's contribution which is exactly 100% and about which I am assuming I do not need to do anything. If my contribution on T4 then it could be under which box.

Also for changes in 2022 return to incorporate the previously missed Jan-Feb 23 contributions, do I need to re file or just submit schedule 7. Any guidance would be highly appreciated!