It's the amount you paid for child or dependent care to the 7th care provider that you entered.
The screen that shows you the message should also show part of the tax form (Form 2441) with the space for the amount highlighted. The name of the provider is to the left of the space for the amount.
If you need to make corrections, it might be easier to go back to the interview for the Child and Dependent Care Credit under Deductions & Credits. When you get to the screen that says "Here's what you spent on care providers" it will list all the providers and the amount paid to each one. Click the Edit button for any provider that you need to make changes to, or click the Delete button to delete a provider.