To change the information already entered about your working status, you will go to:
"My Info" tab then "Personal Tax Profile for - your name" - "Income & Work-related expenses" - Edit - It will be the first question on that page.
If you have entered Tslips of sorts or income-related information, just changing your question will not remove whatever entries you have made regarding your work status. Therefore you may have to go to the "Income" tab and then check your "Tslips" or any other income entries to see if you have entered anything related to the question you have now changed.
Footnote: We at TurboTax want to encourage you and your close family to take all necessary precautions to ensure your safety. Please review the articles provided below for more information during these difficult times: