When creating a POS order, a customer (first drop-down) and contact (second drop-down) will need to be designated. 

Adding a Walk-In

• The Default Customer can be set in Settings > Dockets > General > Default Order Customer. In this example the Customer is set to Walk-In. Below Walk-In a contact can be designated by selecting an option from the second drop-down.

Select an Existing Customer and Contact

• Select the pencil icon to the right of Walk-In.
• Select a customer from the drop-down.
• Select a Contact from the second drop-down.

Add a new Customer / Contact

• Click the + icon to right-hand side of Customer or Contact drop-down. 
• A New Customer or New Contact modal will open. Complete the fields. For more information, see Customers - Creating a New Customer and Contacts - Creating a New Contact.