The Online version is only good for 1 return. But you can use the same email address for 5 accounts. To do another return you have to set up a new account and new user name and pay any fees again. So if you have more than 1 return to do it might be better to buy the Desktop program. And Desktop has more features.
How to start another return in the Online version
https://ttlc.intuit.com/replies/3288574
Do you want to buy the Desktop program? You can buy it here, (or check in the stores for sales or Amazon,etc.)
https://turbotax.intuit.com/personal-taxes/cd-download/
