How could i file from Canada?

If you are using TurboTax to file a US tax return, then you can either e-file or print and mail your tax return.  E-filing is available using TurboTax from anywhere in the world with an internet connection.

TurboTax US online editions for tax year 2019 - https://turbotax.intuit.com/personal-taxes/online/

TurboTax US desktop CD/Download editions for tax year 2019 - https://turbotax.intuit.com/personal-taxes/cd-download/

You will need a US credit card with a US billing address to purchase any of the TurboTax products from the TurboTax website.

Note - If you are receiving a tax refund the refund can only be direct deposited into a US bank located in the US.  Otherwise the refund check will be mailed to the address on the tax return.