How did you earn this capital gain/loss? Did you sell Sold stocks, bonds, real estate, other capital property, or sold qualified small business corporation shares and/or qualified farm property?
This FAQ has some information on Capital Gains/Losses: https://turbotax.community.intuit.ca/community/tax-topics/help/what-are-capital-gains-and-losses/00/873428
If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764