How do I change my package after I have started my taxes. I don't want to have to start again.

Unfortunately, there is no way to downgrade a TurboTax Online return. You would need to create a new return to switch to a lower product. 

If you need to upgrade, TurboTax will give you the opportunity to do so if you enter something that is not supported by your current version. 

To start a new return, select “Start a New Return” from under “My Returns” in the top left corner. Once you have started your new return, you can select “View All Returns” from under “My Accounts & Returns”. Then delete the unwanted return by clicking the small Trash Can next to it or “Delete” under the return’s name.