Please see this TurboTax FAQ for info on how to NETFILE your return in TurboTax Online:
https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/register-activate-services/turbotax-online-submit-tax-return-cra-using/L8pgIGAc1_CA_en_CA?uid=lvnzbuee