You will have to print and mail your tax return claiming the child on your return. The IRS will pay any refund based on claiming the child as a dependent.
See this TurboTax support FAQ for how to print and mail a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/printers-printing/print-mail-return-turb...
Within a year the IRS will contact you and the other party to investigate who should have claimed the child as a dependent.. The lose of the investigation has to pay back the refund based on the dependent plus penalties and interest.
