After you enter the first W-2, continue through the questions until you get to the screen that says "Your W-2 info so far." At the bottom of that screen click the button that says "Add another W-2." If you are filing a joint return, there will be two buttons, one for each spouse. Be sure to click the correct button for the person whose W-2 you are adding. Repeat the process until you have entered all your W-2s.
