You wrote: " I need to print off my 2018 returns and do not have a navigation to choose from so how can I get it?"
I don't know what that means "do not have a navigation to choose from."
Are you using Online TurboTax website in a browser or the Mobile App?
If your 2018 returns were prepared in Online TurboTax, log into your account and at the Tax Home scroll down and expand the section "Your Tax Returns & Documents". Choose tax year 2018, and then click "Download/print the PDF" or if you just need the 2018 AGI, there is a link "View adjusted gross income (AGI.)" If you can't find your 2018 return there, then you likely have multiple accounts and signed into the wrong one. Many people end up with multiple accounts without realizing it. We can tell you how to find the account with the 2018 return if that's your situation.
To access your current or prior year tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
See this TurboTax support FAQ for accessing prior year online tax returns - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...
If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created. TurboTax does not store online any returns completed using the desktop editions.
Or go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript
For a fee of $50 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf