Use the 2nd option from this FAQ (printing from the tax return section) if you need to access forms and worksheets you forgot to print before filing. @rao1
You can go into your return and in the upper right corner is "forms" it pulls up your tax return and you can see the entries made. It's possible you transposed a number when you were keying in your wages. Capital Gains are Schedule D so just click on that "form" and you should be able to see what was input