Salonist is so User-friendly that user can add their new client by following three easy ways.
First
1. Go to Quicksale
2. Put Client Name under search box. Ex. Lisa (New Client)
The moment you added new name or number system will give you an option to Add this Client, check attached screenshot
Second
New client can be added while making an appointment too
1. Go to Calendar >> Staff Calendar
2. Click on New Booking, again add client Name under search box and get an option to Add
Thirdly
1. Go to Clients
2. Click on Action at right side, then Add Client
Add clients Name, Contact, Email, the all details that you have
Also, here is the video tutorial for your reference