Your Platform Subdomain
When you create your account, your site gets a subdomain automatically — e.g., yourname.simplecourse.io. This is where your students access your courses.
You can change your subdomain at any time in Settings → Domains. Click Change next to your platform domain and enter a new one.
If you want to use your own domain instead (e.g., courses.yourdomain.com), see Adding a Custom Domain.