The occupation you enter does not affect your tax return.
If you want to edit your occupation:
•In your return, select "Personal Info"
•On "Personal Info Summary" page you will see your personal details listed (SSN, Birthdate, Occupation, Resident State)
•Click on "Edit" button to the right of your personal details
•On "Your personal info" screen, find the Occupation box, correct your occupation and click on Continue button
•You will be returned to the "Personal Info Summary" page