Just get a Schedule D. If you had owned the stock more than a year start on Line 8; if less than a year start on Line 1. Just follow the line by line instructions, it should not be any problem.
It would not hurt to read the instructions for Schedule D; If you have a gain it will affect the caclulation of your tax, if a loss it will not.
Or, if you are usijng a program it will handle things automatically as long as you fill in line 8 (or line 1) correctly.
Mike (CPA Retired)