Do you have a T5 slip, T3 slip or T5013 slip? If so, that's where the amount on Line 12100 is coming from, and you'll have to go back to the slip to make changes.
If you need to enter interest that's not on a T-slip in TurboTax Online, you can search for "Interest on bank accounts not reported on a T-slip" on the Tax Home page.
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