For how to file Form 8332 in TurboTax, see https://ttlc.intuit.com/community/accessing/help/where-is-form-8332/00/26047 .
I suspect your ex-husband's lie is allowing him to claim head of household filing status, dependent care credit, and possibly EITC based on your child; Form 8332 only allows him to claim the child tax credit and possibly a few other things tied to the now-suspended dependent exemption. By lying, he's almost certainly taking money YOU are entitled to from Uncle Sam. You might wanna talk to your divorce lawyer and/or a tax professional about this.
