Assuming the you have either paid the TurboTax online account fees with a credit card or have filed the 2018 federal tax return and it has been accepted by the IRS -
To access your current or prior year online 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)
When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state.
This will take you back to the 2018 online tax return.
I need paper copies of my 2018 tax returns.
I am buying a house
Did you prepare the 2018 return online? If so, log in and at the Tax Home go to the section "Your Tax Returns & Documents." Expand that section, if necessary, and choose tax year 2018. Then there should be a link "Download/print the PDF."
If you used desktop software (CD/download) to prepare the 2018 return, then it will not be in an online account.
Once I am on the login screen and login it bring me back to the login screen again. it is not going to the home page to select the year or info
You are likely having the known issue of a log-in loop. Try a different browser. Chrome appears to work for a lot of folks, but it's unpredictable which browser is best for any user's system.
See this FAQ:
I need a copy of my 2018 Federal tax return asap.
Did you see the instructions in the comment right above your post that tells how to get the 2018 return? If so, what is the issue?
If you can't find the 2018 return you prepared in Online TurboTax, we can tell you how to look for multiple accounts.