Filing Married filing jointly : Where does the spouse income get input?

You will enter your spouse's income in the same way you entered yours.  It makes no difference the process is the same if it is your income or your spouse's.  The only difference is that you will indicate the income belongs to your spouse when you are asked this question.

If you set up your return correctly as a joint return then every income screen will show spots for each spouse with your names by them.   Look more carefully for your names on the income screens.

When you enter your own information in My Info, you have to answer the question "Were you married?"  If you click the button for Married, then a drop down will appear that asks, "Do you want to file this return together with your spouse?"  Then you choose yes to file a joint return.  You would then enter your spouse's information into Personal Info.  Whenever you are entering income information there should then be a spot for you and for your spouse's income information.

When you prepare a joint return you include all the information for both spouses on the SAME tax return.  Include all of your personal information, all of your income from every source, all dependents (if any), all credits and deductions for both of you.  You get ONE refund with both names on it.