The shared student password:
As explained in this blog post, students have always been able to log in to textivate using their teacher's username plus a shared student password. This allowed them to take part in Challenges, Sequences, etc.
One downside of this approach was that a Sequence had to be completed on the same device on which it was started. So a student who didn't finish a Sequence in class time would not be able to finish it at home (unless they took the device they used in class home with them...).
Also, because students were only required to identify themselves at the end of a Sequence, this meant that Sequence scores were only ever submitted for fully completed sequences.
NEW Individual student passwords:
If you click on the "Manage students / classes" icon (as shown in the image above), you'll see a screen which displays a list of all of your classes. You won't have any at first, so just click on the "+ New class" button...