Not sure what you mean by that exactly. Did you try to e-file? Was it rejected for a duplicate Social Security number? If that happens and you know you have entered your SSN correctly, then print, sign and mail your tax return. If your SSN was entered into the system---even if someone entered it by making a mistake---you cannot e-file this year so the only way you can file is by mail. The IRS will not tell you who used your SSN.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return.
Federal and state returns must be in separate envelopes and they are mailed to different addresses. Read the mailing instructions that print with your tax return carefully so you mail them to the right addresses.