1099-B for which the basis is not reported/term is "unknown." My form says to report on form 8949 with box B or E checked and/or schedule D, Part I or II which aren't av

TurboTax keeps directing me back to the 1099-B, but I cannot complete it because there is no cost basis (says "unknown"). my 1099-B says transactions for the basis is not reported to the IRS and the term is unknown should be reported on Form 8949 or Schedule D, Part I or II, but I cannot access these forms.