To remove your personal exemption on your amended return you can follow this procedure, after your read all the information about the amended return. It's important to keep the original return in tact until you are ready to amend.
Personal Info tab > Edit beside your name > Answer the question about someone is claiming you (see images attached)
Use the information below to amend your return. The IRS does not allow you to e-file this return. You can find the mailing address for your area at this link: Where to File Paper Returns With or Without a Payment
For the mailing address and state amendment requirements use the information below by selecting your state.