I need to sing 8879 and 8453

It sounds like you entered category totals for asset (stocks, bonds, mutual funds) sales instead of entering individual transactions.  When you do this, you have to mail a copy of your Form 1099-B with the transaction details to the IRS.  Form 8453 will identify it with your tax return. Make sure you send a copy of your Form 1099-B.  To print your Form 8453 and 8949 see the following FAQ: