A capital loss carryover has to be carried over from year to year until it's used up. If you had a capital loss in 2018 and you could not deduct the entire loss that year, you have to carry it over to 2019, then 2020, and so on. You can't skip years.
KrisD15 has showed you how to enter a carryover amount, but you can't just take the carryover loss from 2018 and enter it in your 2024 tax return. You have to recalculate your tax returns for all the intervening years in order to determine the correct carryover amount from 2023 to 2024. Some of the loss should probably have been used in the intervening years, or perhaps it is already all used up.
