Look on last year's Schedule D, specifically lines 16 and 21.
See Also
The Primary Risk of Investing: Permanent Loss of CapitalWhat is a capital loss carryover?What is Capital Loss – Definition, Advantages and DisadvantagesIf the line 16 loss amount is greater than the number shown on line 21 (pretend they're both positive numbers), you should be getting a capital loss carryover on this year's return.
If you transferred data from last year's TurboTax return, your carryovers are already accounted for.
