Just want to know if I can stop and start anytime.

[divakfoy]

If that causes any problems?

[ThomasM · Accepted solution]

Yes, you can go up to the My Account link in the upper margin of the screen.  Click on that and you'll see a dropdown box appear.  The last choice in the list is Save and sign out.  Just click on that and TurboTax will save your entries for the next time you sign in.