If you are using TurboTax Desktop, you can link to the QBI Worksheet from the Schedule E Worksheet. TurboTax should prepare this for you automatically, but you can do so manually in FORMS mode .
There is a question in the Interview about QBI, but you may have missed it. You will be able to Efile with this statement in your return.
This link gives detailed info on the QBI deduction.
To Amend your 2018 return and claim a QBI credit, you will need to open your return in TurboTax Windows for 2018 and manually use the FORMS, as above, after indicating you want to amend in 'Other Tax Situations'.
Click the link for instructions on How to Amend a 2018 Return.
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