I am not sure how to file my income, as I am a full-time PhD Student in Canada and my pay comes from the university, where I teach as an assistant.

Are you a U.S. citizen trying to prepare a U.S. return---or are you a citizen of Canada  or international student in Canada?  This is the user forum for U.S. tax returns.

For help with Canadian taxes, please post your question in the Canada TurboTax user forum., at the following link.

https://turbotax.community.intuit.ca/community/turbotax-support/help/03/en-cahttps://turbotax.intuit.ca/tax-software/index.jsp

How you file it, with the IRS, depends on how the income is reported to you, if you are a US citizen/resident. How is your pay reported to you? Is it reported on a form T-4 (Canadian W-2)? Is it treated as scholarship? Is it treated as tuition remission? Something else? How much is it (is it enough to result in a tax liability)? Can you be claimed as a dependent by someone else?