Did you transfer a Joint return over from 2015? Then to change to separate you each should set up new accounts and not use the transferred info.
you can use the same email address for 5 accounts. How to start another return in the Online version <a rel="nofollow" target="_blank" href="
https://ttlc.intuit.com/replies/3288574">https://ttlc.intuit.com/replies/3288574</a>
