Hello @QuestionTaxSpouse
If you are using TurboTax CD/Download, go back in INTRODUCTION section and select Name, Info about your spouse or partner on the left navigation menu. The spouse's income is entered there.
If you are using TurboTax Online, go back in My Info section and select Additional information about Spouse on the left navigation menu. The spouse's income is entered there.
Thank you for choosing TurboTax,
Magalie B.