If your Science Interactive representative sets up your sections for you, they may send you the enrollment link(s) for your course. However, you can always look up the link yourself by following the instructions below. For more information see Enrollment Links: Best Practices.
You can sign in at www.myhol.holscience.com using your institution email address and the password you set. If you can't remember your password, click "Forgot your password?" to reset it.
Make sure to double check the session so you're using this semester's course—the link will not be same for two semesters in a row.