The form 1099 that you received is what the attorney needs to file (with the amount in Box 10), and not something you need to enter and report.
If the payer issued a 1099 in your name and not the attorney's, then you should report the full amount of $15K on your return because the IRS information return matching program may pick it up. In your later post, you clarified that GM sent the 1099 to the law firm, which makes more sense based on the way it was completed. If you didn't receive any 1099 in your name / SSN, and the settlement is fully nontaxable to you based on your explanation, then you shouldn't need to report it at all and can just keep the documents in case they are needed later.
As I suggested in my original response, and as later mentioned by @DaveF1006, if the settlement is fully nontaxable to you because it is compensating you for your loss and not punitive damages, then delete the original entry you made. If you are going to enter it at all, enter it instead under Miscellaneous Income, then Other Reportable Income.
You would enter the $15,000 as Other Reportable Income; then, make a second entry with a negative number to reverse the amount, just to have the $15,000 accounted for on your return. Use the explanation fields to describe the payment.
You do not need to complete a Schedule C. That reference is for the attorney who received the 1099 with $10,000 in Box 10.
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