You will need to file and amended return for 2018. In order to add income and expenses for your Schedule C you will need to upgrade to the Home and Business version of TurboTax.
You can figure and file your amended return by hand, but that would take a long time is figure all of the information and fill in the amounts on the correct forms. You will need form 1040X, 1040, Schedule C, Schedule 1 and if you live in a state with state income tax you will also need to file and amended form with the state.
The best option is to use the software to create the amendment.
How to Amend prior years tax returns using TurboTax
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