After you enter the first W-2 you will see a W-2 summary screen. Under the lower left corner of the summary will be a button to 'Add Another W-2'.
The easiest way to add another W-2 is to search for w-2 while logged into your return. The search box is in the upper right-hand corner (Windows) or the upper left corner (Mac). If this does not get you back to W-2 then please go to the Federal Taxes Tab and select wages and income and then you can select add a W-2 and select spouses name.
Click the Jump to W-2 link in the search results and we'll take you to the screen where you can enter another W-2 by choosing +Add another W-2 (online/mobile) or by clicking the appropriate "Add" button (desktop software).