How do I go back into my tax and add more income and also put my expenses into my file?

[TurboTaxSusan]

If you have not NETFILEd your return, you can just go back in and make the changes you need.

You can make changes after you have filed your tax return through the CRA or through ReFILE: https://turbotax.community.intuit.ca/replies/2647992