gistfile1.js

$(function(){
    $(document).foundation();
 
    // Hides every element except the first one
   $("fieldset.person").slice(1).addClass("hidden")
 
    // Used the "on click" to handle event bubbling
   $(".row").on("click", ".add-person", function() {
      // Finds the last fieldset that is visible and makes the next hidden one visible
     $("fieldset.person").not(".hidden").last().next("fieldset.person").removeClass("hidden")
    })
 
  });