If you prefer to give your staff or Instructors an initial password, here's how to do that.
Temporarily change the email address to yours (or one you can access) on the Instructor's profile page (My Company > Users > Instructors)
Click "Reset Password" and enter your email address (or the one you have access to) to send the password reset email.
Check your email and click the link to set up the password
Change the email address back to the Instructor's email on the Instructor profile page (My Company > Users > Instructors)
Ensure you have clicked the box to allow the Instructor login access