You’ll only see the REFILE button next to your return if you sent your return by NETFILE and you got a confirmation number from the CRA.
To do a ReFile, you'll need to sign in to your TurboTax DIY (Online) account and click the ReFile button next to that return and make the changes. (If you used the CD/Desktop version, you will need to sign in to that year and select "change a filed return."
For further details, please check What is ReFILE? and I have filed my tax return. Can I still make changes?
In all cases, regardless of the software version used, you can do so directly in your My Account CRA and Revenu Québec, or by mail, by completing the following forms:
CRA: T1-ADJ T1 Adjustment Request
https://www.canada.ca/en/revenue-agency/services/forms-publications/forms/t1-adj.html
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