public ActionResult Index() {
    // IsUserAnEditor is a placeholder for a method to determine whether the user
    // is an editor based on whatever role technology you're using.
    MyModel model = new MyModel { IsEditor = IsUserAnEditor() }
    return View(model);
}

@model MyModel

....

@if(Model.IsEditor)
{
    // Code to add the "Edit" link, this is just an example, customize for your needs
    <span>
    @Html.ActionLink("Edit", "Edit", "MyController", new { id=Model.ID })
    </span>
}