Yes, if you have not filed  your return- Go to the left hand side menu and click on Income- TSlips- Then you should see the T5007 checked off and continue- once you get to the T5007 you can click on Edit and then change the amount that you have entered.

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What if it was filed already? I thought I was filing the 2022 return and didn't realize it was for 2023 til after the fact..

If you have already filed, you will need to wait for your Notice of Assessment(NOA) from the Canada Revenue Agency (CRA) then do an adjustment. Since it was only matter of a different amount, the adjustment may already be done by the CRA which you can verify on your NOA when you receive it later (not the express NOA).

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