Yes - amend your personal tax return to include Schedule C - Profit or Loss from Business. To do this you will need to use the Premier or Self-Employed [Home & Business for CD/Download] versions of TurboTax.
For instructions on amending your 2018 return please see the following FAQ:
https://ttlc.intuit.com/replies/7276605
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"