The ONLINE system will probably never have that option ... and it is more expensive than the Downloaded version so you should switch to the superior downloaded Deluxe version instead of using the online Premier version ... you can switch now and continue your return ... Deluxe is all you need (Basic if you don't need to file a state return) since all the downloaded versions can handle all the same information:
If you haven't paid, you can purchase a desktop version (CD/download) from TurboTax here:
https://turbotax.intuit.com/personal-taxes/?view=desktop
If you have already input a considerable amount of data into your online return, if you wish you can move the 2015 data file to your desktop and finish it in the desktop software without having to start over.
https://ttlc.intuit.com/questions/1901476-how-do-i-switch-from-turbotax-online-to-the-turbotax-softw...
