Thanks Karine, however, I don't see a logout button at the top right hand corner.....

Are you using TurboTax Online version or TurboTax Desktop version?

I bought the premier version and loaded it to my laptop.

Ok! then you will need to save your tax return on your computer. Before closing the window click on the file button found at the top left hand corner and select Save As. Or you can always close the window and the software will prompt you to save the file you are working on.