You might be trading through your spouse/ parent's/ grandparents demat account- in this case there might be trading income and no other source of income since they might be houseworker/ retired/ or any other reason. ITR2 needs to be filed for capital gains and ITR3 for business income (speculative/non-speculative trading).
In this case, you can import your investments onto Quicko from Zerodha or the given partnerships on Quicko. If you do not see your broker, you can chose to upload these trades via Quicko Capital Gain Template or Quicko Tax P&L Template.
You do not need your Form 16 in case of only trading income for the individual (Form 16 is for salaried individuals). However, Form 26AS should be referred to for seeing income from any other sources and any taxes paid through out the year.
You can click on e-file once complete income situation is entered, and check for any validations to review and complete the return.