Assuming the two of you are filing together for the first time in 2022 (congratulations by the way!), you'll want to enter the adjusted gross income (AGI) from each spouse's originally filed 2021 return.
Don't combine your two 2021 AGIs into a single figure—your return will get rejected.
If a spouse filed jointly in 2021 with somebody else, still use that AGI.
If you and/or your spouse didn’t file last year, just tell us when we ask in TurboTax. If you already entered a number for your AGI, edit it to 0 instead.