You will need to use IRS Form 4684, Casualties and Thefts if you had a loss due to a federally declared disaster.
Using TurboTax -
Click on Federal Taxes (Personal using Home & Business)
Click on Deductions & Credits
Click on I'll choose what I work on
Under Other Deductions and Credits
On Casualties and Thefts, click the start button
Please review how to report Disaster Area Losses in IRS Publication 547 Casualties, Disasters, and Thefts starting on page 22 - https://www.irs.gov/pub/irs-pdf/p547.pdf#page=22
