If your return has been set up correctly as a joint tax return you should be able to go to the W-2 entry screen and click Add W-2 to enter your spouse's W-2.
When you are entering income on a joint return, every income entry screen will either have a spot with both spouse’s names there, or when you click to enter a W-2, 1099R, etc. it will ask you by name which spouse it is for. You do not have to wait for the software to “ask” you for your spouse’s income.