Online is only good for one return per account. But you can use the same email address for 5 accounts.
How to start a new online return
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
The Desktop CD/Download can do unlimited returns and efile 5 for free
https://turbotax.intuit.com/personal-taxes/cd-download
If you want to switch to the Desktop program we can tell you how, even before paying for Online.
