The Coach Catalyst software is set up to be used in the app or on the web.
All coaches and clients can log-in at: app.coachcatalyst.com or one the custom subdomain you can set up within your Account Profile
To find the subdomain:
Settings > Organization Settings > Change/Create the Custom Subdomain > Hit SAVE on the bottom right of the page
Don't forget to upload your logo and update your theme color on this page.
Here is what your custom subdomain would look like, but with your business logo: