It says Check This Entry: "Schedule C (Rideshare Driving) -- Schedule C Worksheet: Amount - Misc Exp Other must be entered". How can I fix it?

It sounds as if there is an entry in the Expense category, Other Miscellaneous Expenses which needs a corresponding amount. This often happens if you had an expense there last year, that imported into this year's return. If you don't need the entry, you can delete it there.

1. Click on Federal, on the left menu bar
2. Click on Income and Expenses, at the top
3. Select Review for Self-employment Income and Expenses
4. Select Review for your business
5. Click Start or Review for Other miscellaneous expenses as show below

You will see all of the miscellaneous entries in a list. If there is anything you won't need again, you can click on the trash can icon, on the right, to delete from your return.  If it is zero this year, but you might need it in the future, you can enter 0, and it will save the category for next year but won't ask for an entry this year.