On the left side of your screen is a column with four titles: "Dashboard", "Projects", "Customers" and "Company". What interests you here is the title "Customers".

Select "Clients (Local)" and right click with your mouse. You can now create a new customer. When you click on "New Customer", a window will appear as shown below.

Fill in the name and click on "Ok". You will then be redirected to the customer file. Fill in the different lines to create the file with the complete details of your customer.

The data is saved automatically in real time.