If you haven't yet filed, you can go into the Personal Info section to click the box Someone can claim me as a dependent.
If you claimed yourself and have already filed, then you will need to file an amended return. When amending, the box Someone can claim me as a dependent will need to be clicked so that your parent can claim the exemption. Your parents will need to print, sign and mail their tax return this year.
To file an amended tax return, follow the steps below: