How do I change the status of someone else being able to claim me as a dependent?

If you have filed, you will need to wait to see if your return is accepted or rejected.

• If rejected, you can make any necessary changes.
• If accepted, you'll need to amend your return. 
• To avoid unnecessary delays, do not amend until your original return has been fully processed.  You will need to print and mail the amendment.  
• Allow 8-12 weeks for processing.

See this TurboTax FAQ for help with amending.

You can check the status of your amended return here, but allow 3 weeks after filing for it to show up.

If have not filed yet, you can make the change to your return prior to filing.

To change your dependency status you will need to follow these steps:

• With TurboTax open search for personal information and then click the "Jump to" link in the search results.
• Follow the on-screen instructions to check or un-check the box that you are being claimed as a dependent.