You can view the information you enter from your W-2. You can print out your return & all the worksheets. Or, sign back into your return, Search for W-2 using the search in the upper right corner and then click the Jump to link in the search results, this brings you to the Here's your W-2 info screen. You can click Edit on your W-2 to see the information entered.
If you cannot get back into your return, see the following
1. In TurboTax Online, sign into your account.
2. Select Tax Home in the left menu.
3. Scroll down to Your tax returns & documents.
4. Select 2018, and then select Add a State (you're not actually adding a state, this just opens the return back up)
5. Make changes and then refile