How to fetch the value against a foreign key from its original table using WPF

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C#

Visual-Studio

WPF

I have recently migrated from WinForms to WPF. and dont know much about its databinding concepts. That's why I need help in this. I have seen EF6 tutorials but they're not making it much clear to me as to how do I fetch a value that is store in another table; I mean the table name in my instance is tblOrderHistory. This table has employee_id and customer_id columns, and I have to fetch the employee and customer names against those IDs from their respective tables. But I dont know how to proceed with it in the context of WPF. Please help me, and give me this quick start so that I may proceed with the rest of my application's bindings.
Your help would be greatly appreciated.

What I have tried:

I have installed the Entity Framework 6 into the Visual Studio app. and the database model is also fetched in it. But I have no specific idea about the next steps and how , where to proceed.