After logging in, you will see "+ Client" or "New Client" buttons. Click any one of those and it will take you to a simple "Add Client" page. It accepts minimal info to get started quickly even while starting an actual visit. After clicking "Save", you will got a to more detailed screen to enter any other details you need.

View the YouTube video here: https://www.youtube.com/watch?v=HviqKucsQUI