Each teacher has one demo student account to preview how it looks like from a student's perspective.
After logging in to the teacher's account, click the profile photo found at the upper right corner > select 'Switch to student account' to enter your demo student account.
To assign homework to your own demo student account, look for the class named like '1-TrStu' which is the class your demo student account belongs to. You need to switch to the demo student account at least once before assigning any homework to it.
In your demo student account, you can always click the Switch to Teacher button at the bottom left to return to your teacher account.
