If you are married, mark that you are married and proceed.
If you are not married, you cannot file with someone else on your federal return. The IRS says:
Registered domestic partners may not file a federal return using a married filing separately or jointly filing status. Registered domestic partners are not married under state law. Therefore, these taxpayers are not married for federal tax purposes.Jun 28, 2019 from Answers to Frequently Asked Questions for Registered Domestic
If you want to file a second person, you can begin a new tax return.
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