What do I do or can do to fix everything on my taxes

You have a lot of issues.

First---2017---you cannot use the online program to file a 2017 tax return.  If you are trying to use online for 2017--STOP.  Online is ONLY for a 2019 return.

How to prepare a 2017 return:

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)

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.

If you are getting a refund, there is not a penalty for filing past the deadline.  If you owe taxes, the interest/penalties will be calculated by the IRS based on how much you owe and when they receive your return and payment. The IRS will bill you for this; it will not be calculated by TurboTax.

You do not say if you filed returns for 2018 or 2019; you only say that someone claimed your children.  If you were the custodial parent--the one the children lived with for over half the year--then file your own tax returns that claim the children and mail them in.  The IRS will contact you and the other party and sort it out.

You still need your 2019 W-2?

W-2's come from your employer, and they have until Jan. 31 to issue it.  Some employers allow you to import the W-2 through the software, but for security reasons you still need information from the actual W-2 to import it.  You might need to phone, email and/or snail mail an old employer to make sure they know where to send your W-2.

https://ttlc.intuit.com/questions/2561916-how-can-i-get-a-copy-of-my-w-2

https://ttlc.intuit.com/questions/1934390-how-do-i-import-my-W-2

https://ttlc.intuit.com/questions/2588751-why-can-t-i-import-my-w-2

https://ttlc.intuit.com/questions/2938482-how-do-i-take-a-picture-of-my-w-2-in-turbotax-online

https://ttlc.intuit.com/community/income/help/what-if-it-s-february-but-i-still-don-t-have-my-w-2/00/25998

https://www.irs.gov/taxtopics/tc154

Other ways to get W-2’s:

Pay Social Security $86 per W-2:

https://www.irs.gov/help-resources/tools-faqs/faqs-for-individuals/frequently-asked-tax-questions-answers/irs-procedures/transcript-or-copy-of-form-w-2/transcript-or-copy-of-form-w-2

You can get a wage and income transcript from the IRS:  It will not show the actual W-2, 1099’s, etc, but will show the income information the IRS received.  It will not, however, show your state information. It will only show the federal information.

https://www.irs.gov/individuals/get-transcript