Mailing address is for U,S.A only. Can't enter my Canadian address since I am a Canadian citizen

Are you doing a USA retuirn?

No

My wife and I are both Canadian citizens

This is the US forum.     Here's the sign-in page for TurboTax Canada  <a rel="nofollow" target="_blank" href="http://turbotax.intuit.ca/tax-software/index.jsp">http://turbotax.intuit.ca/tax-software/index.jsp</a>  

Contact TurboTax Canada Support  <a rel="nofollow" target="_blank" href="https://support.turbotax.intuit.ca/contact/">https://support.turbotax.intuit.ca/contact/</a>

As stated in your prior post, go to this TurboTax Canada website for the software to be used with a Canadian tax return (choose Online, Download or Mobile) - <a rel="nofollow" target="_blank" href="https://turbotax.intuit.ca/personal-tax-software/online-tax-software.jsp">https://turbotax.intuit.ca/personal-tax-software/online-tax-software.jsp</a>
Go to this TurboTax Canada website for support on a Canadian tax return - <a rel="nofollow" target="_blank" href="https://turbotax.community.intuit.ca/tax-help">https://turbotax.community.intuit.ca/tax-help</a>

In the Personal Info section for Mailing Address, under Type of mailing address choose Foreign country from the dropdown.  Then you can enter your street address, City, Province or state and Postal Code.  Under Country choose Canada from the dropdown.