Yes! You will be able to add or remove a non-student applicant, or edit information on your application further after initial submission as long as the school's deadline has not passed.
To learn about adding/removing a student, click here.
To learn about adding/removing a school, click here.
To remove a non-student applicant:
Login to Clarity and click the purple "edit application" or "continue application" button
Return back to Step 2 Other Dependents
From the dropdown at the top of the page choose the dependent that you wish to remove
Scroll to the bottom of the page and click the "remove dependent" button
Click Save and continue
Return back to Step 4 and re-submit for the newly added school(s) to receive your updated application. If you previously paid the fee, you will not be asked to pay again.