All organizational users should have received an onboarding email when your admins signed you up under your school's profile. You need to set up their password via the link on the email.
If you happened to miss the window to set a password, you can do so by clicking the Forgot Password link on the login page on whichever platform you prefer. The Web app can be accessed here. Desktop and mobile downloads can be done here.
After you've set a password. Log in on the main page of the app. You'll be brought to your Dashboard. You can start recording your lectures by pressing the Record button!
Please refer to the article on how to create a recording.