If you insist on using free edition, you can file without Schedule D.
Then file form 1040-X with schedule D
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get Form 1040-X from IRS website and mail it in with your corrected Schedule D, which you can also get in fillable PDF.
Note: when you are not changing any dollar amounts on your 1040-X, you can leave all the lines 1-23 EMPTY.
Do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
Part III explanation: "Oops forgot to attach schedule D"
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