To get the work from home expenses deduction, you would also need to go through the Employment Expenses section of the interview. This FAQ shows where to claim your employment expenses in TurboTax Online: https://turbotax.community.intuit.ca/community/claims-deductions-donations/help/where-do-i-claim-my-...
FYI: You can claim $2 per day (up to $400) in employment expenses, which is a deduction from your taxable income, not a credit.
You can make changes after you have filed your tax return through the Canada Revenue Agency (CRA) or through ReFILE. This FAQ has more information: https://turbotax.community.intuit.ca/community/tax-return-amendment/help/i-have-filed-my-tax-return-...
