If you preview your course right now, you will see that the domain is a little bit jumbled. So here's how to make it look neat.
Navigate to Memberships, then Courses, and then Settings.
Click on Domain Setup.
Choose Custom Domain and another section will popup at the bottom, and you will need to enter your custom domain.
Copy the domain name from your domain registrar, and place it in the Enter Custom Domain field.
Note: You'll require a different domain registrar. The process may vary, but the overall steps are similar.
Further explanation regarding domain record type is mentioned in the video.