In order to add new customer information on new ticket, go to Create Ticket page. On top left there's a customer information section.

You can also click on Edit Ticket of an existing repair ticket to update customer information. 

If the ticket generated is for an old customer, you can simply select him from the drop down list and his details will appear in the customer information section. 

If no customer information is entered while generating the ticket, by default it will be considered a Walk in customer. 

You can also add new customers from the same screen by clicking Add New Customer. A same screen will appear where you can add information for the new customer.