If you had income reported to you on a form 1099-NEC, it would normally represent self-employment income. This would be true even if you just engaged in the activity yourself and it simply involved services you performed for compensation.
Otherwise, you need to research your return for something you input that referenced "rideshare." It may have come from a prior year.
If it doesn't apply to you, you may be able to delete the form that references it by using the following menu tabs in TurboTax:
- Tax tools (on the left menu bar)
- Tools
- Delete a form
Find the form or schedule in the list and delete it.