At this time, it's not possible to show that a house is fully paid off or that you paid cash for it, but there is a workaround: you can enter a the amount of a mortgage that's paid been off, or - if you never had a mortgage - instead enter the price you paid for your home. Your home will then show up as being paid off and your equity will equal the home value itself.
1. Under "Home value", click "Edit information"
2. Enter the amount, interest rate, and origination month and year so that the mortgage shows as paid off (you can make up these details if you never had a mortgage)
3. Click "Save," and then refresh the page
You will now see the full estimated value of your home as your equity.