I need to amend my return and be a dependent

If your return has been accepted, then you will need to amend your tax return by following the instructions in the FAQ article below. Please note: the person who is supposed to claim you as a dependent will need to file by mail.

Once you are in your amended return, take the following steps to change your personal exemption.

1)    Go to Personal Info > Personal Info Summary > and click Edit to the right of your name.

2)    Scroll down to Question 3 - Someone else can claim me on their tax return.  

               a.       If you select yes – someone can claim you

               b.      If you select no -  you claim yourself

https://ttlc.intuit.com/replies/3288565