TurboTax Online is not available for 2017. You'll need to purchase and download the software for tax year 2017.
Please see this link for instructions on filing a prior year return.
You are using the wrong software if everything you are seeing is for tax year 2018. If you started a return in online 2018 software, it is now too late to e-file that return anyhow--luckily for you. Scrap it, and you have to start over in the correct 2017 software.
To file a return for a prior tax year
If you need to prepare a return for 2016, 2017, or 2018 you can purchase and download desktop software to do it, then print, sign, and mail the return(s) Make sure you purchase 2017.
https://turbotax.intuit.com/personal-taxes/past-years-products/
Remember to prepare your state return as well—if you live in a state that has a state income tax.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Note: The desktop software you need to prepare the prior year return must be installed/downloaded to a full PC or Mac. It cannot be used on a mobile device.