You have to go back to the page with the check mark, keep it checked, and then continue through the pages, deleting any amounts you put in. Then remove the check mark.
If you are still unable to resolve this issue, please contact our phone support team, as they will be better able to assist you. To talk to our phone support team, visit https://support.turbotax.intuit.ca/contact/ . After entering some basic info about what you need help with, the page will give you the phone number for the team best suited to help.