This article covers the "Our Customer" field on the Job (pictured below).
If you click the ellipsis next to the customer name, three options display (select customer, view/modify customer info, and customer statistics)
1. Select Customer
If you click "select customer", the message below will display. See Move a Job to a Different Customer for instructions on changing the customer selection. 
2. View/Modify Customer Info
When “View/Modify Customer Info” is clicked, the customer screen opens.
3. Customer Statistics
When “Customer Statistics” is clicked, the customer stats open.