Adding more fields to ASP.NET Identity 2 using MVC db first

Question

I have a project with ASP.NET MVC database first where I implemented ASP.NET Identity 2. In the table called AspNetUsers, I want to add extra fields.

1. IsOnline - bit,
2. UserType - NVARCHAR(50),
3. Department  - NVARCHAR(50)

Since I am using database first in the project, please how do I add this extra fields to the project