Do you have a cost basis provided by the broker? Is the amount of sale and amount of cost basis broken out by short term(under a year) and long term. You used to be able to enter various as a date, (can't get my mock up to work right now)
Disclaimer: Not a tax professional. Information gathered from internet links. Anything dated in June 2019 was posted in prior years and is before the 2019 limits and changes.
