Firstly you need to make sure you are signing into the year in question and then review the information below to assist you in signing into your online account:
In this case, it is 2017 here: https://ww2.2017.turbotaxonline.intuit.ca/
These are the most common reasons for having to reset your password every time you log into your online account:
Once you figure out which one works for you, then proceed with instructions below to ensure you are not prompted to reset your account again.
Please refer to this link to assist you in resetting your password:
How do I change my password in the online edition of TurboTax? https://turbotax.community.intuit.ca/replies/2648030
you may also want to try a different browser, or clearing your browser cache. Instructions here:
How do I clear my cache (browsing history)? - https://turbotax.community.intuit.ca/replies/2647843