Enter the information from Form 1099-B under Stocks, Crypto, Mutual Funds, etc. Report the "Cost or other basis" from Form 1099-B Box 1e, even though it's not reported to the IRS by the brokerage firm (this is common).
You may have received supplemental information from the broker that reports a different basis. Use this number instead of the amount shown on Form 1099-B to be sure you report the actual gain or loss. Check the box under Box 1e for "The cost basis is incorrect or missing on my 1099-B," which will allow you to enter the corrected basis amount.
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