After you file

You have to enter all your W2s into the same tax return one at a time.   After you enter a W2 you can add another the same way, go to
Federal Taxes Tab
Wages & Income
Wages and Salaries- Click the Start or Update button

 

If you see a W2 Summary, at the bottom is a blue Add another W2 button

 

Then if you are married you should have 2 buttons...Add w-2 for (taxpayer name) and Add w-2 for (spouse name).   Click on the correct button to add a W-2.