How to connect existing database to visual studio 2015 MVC

I need to create web site using asp.net mvc c# I started by creating database first

so that I open visual studio 2015 select File - new project - Visual C# - asp.net web application - MVC

I need after that connect database to my project to add and update and delete data existing in tables and viewes

so that

How i connect my database to my project using mvc to make insert and update and delete and display transactions ?

my database already created and exist and i have 40 tables with relations ERD