I can not access my 2018 and 2019 tax returns file, isnt it supossed to be there for 7 years

Yes, you can, however, you need to access them from the 2017 or 2018 versions, not from the 2020 version:

https://turbotax.intuit.ca/tax-software/prior-year-taxes.jsp

I hope this was helpful

I would like to my and my wifes 2019 tax year returns

This TurboTax FAQ tells you how to view your tax return from previous years.