If you use the Online version it saves each entry you make. But only in your online account. You have to log in each time with the same username and password. You can log in from any device. Can't you find your account?
Or are you using the Desktop program? On Windows or Mac? The Desktop program only saves to your local computer. For Windows you have to manually save each time you stop. Go up to File-Save. It should ask you to save when you exit or start a new return.
What problem are you having?