If the entire loss is disallowed under the wash sale rules, then you should leave the entry blank, not enter -0-. If you are unsure as to what the loss amount is, I'm sure if you called your broker they could help you with it.
The 1099-B worksheet is referring to a worksheet that will be available when you print out your return. TurboTax generates it and it is for your information and to be kept with your records, but not filed with the tax return.
The loss carryover could be from a year prior to 2019. If you had a loss carryover in 2018, it would be usable in 2020 if you did not file a tax return in 2019.
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