First of all please ensure you have received your Labster.com login details from your Labster representative.
Once you have those details (email and password), then please proceed to this page: https://courses.labster.com/login?next=/dashboard and sign in (see image below):
Once you are signed in, you will be able to view all the simulation courses that you have requested access for. From here, you can play the simulations and check your Teacher Dashboard to view the student performance.
Read more here.