Using Stored Procedues to make CRUD in Asp.Net MVC witth SQL

I want to create my CRUD with stored Procedue in Asp.net MVC, the problems is that I was followiing the way in this link: http://www.c-sharpcorner.com/UploadFile/4b0136/stored-procedures-in-entity-framework-6-in-mvc-5/. The problem is that this link we can only do it if we don't have an existing model and in my case I'm using my Database of SQL. Somebody can help me, I need to use stored procedue to insert to my table because before I insert the information I have to make some validations from other tables.