How do I file my return separately from my spouses?

[beanewburg]

Where is the button for "file for both us" ?

[TurboTaxSusan]

If you are using TurboTax Online, you'll be asked if you want to prepare only your own return or both you & your spouse's when you start the return. If you've already started your return but what want to change your answer to the question, then you'll need to start a new return.