If your dependent has completed their income tax return and has income- you would see it on line 23600. If your dependent hasn't completed their return, once they do complete it you will then see an amount on line 23600. Their T4 goes on their income tax return - and once its completed you will see their Net Income. 

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i need to edit my dependant's income, but i can't figure out how to navigate back to there, where in turbotax online is dependant's income?  thank you!

You can find  your dependants income by going on the left hand side menu and go to deductions: scroll down to Additional Dependants Information. The page will then open to where you will see your dependants names and you will add their income in that section.

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