How to connect existing database to visual studio 2015 C# MVC to insert and update and delete and display

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ADO.NET

MVC5

web_application

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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

What I have tried:

How to connect existing database to visual studio 2015 c# MVC to insert and update and delete and display