How do I do have a Submit Button action in MVC4

Anything of type button on the form will cause the form to submit.

<button>Submit</button>

You can also have a button of type submit

<input type="submit" value="Submit" />

Alternately, you can have buttons with an ID or class, and catch the click with javascript. In that case, you can either submit via javascript, or just call your forms submit action.

$(function(){
    $("#submit_it").click(function(){
        //do work here
        return false;
    });
});

<button id="submit_it">Submit</button>