After you check the box that the cost basis is incorrect or missing on my 1099-B, select Continue to the next screen where you can enter the correct basis.
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Press Continue at the bottom right of your page. After entering your information on the page Now, enter one sale on your... and you check the box The cost basis is incorrector missing on my 1099-B, press Continue. The next page should be what @FangxiaL previously posted.