Sorry No. Online is different. It is one return per account. 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. And there are other differences too. Actually the Desktop installed program can do unlimited returns and efile 5 for free.
How to start another return in the Online version
https://ttlc.intuit.com/replies/3288574
