Can I move a charity/cause to the end of the drop down list?

You don't have much control over the order of the items in the drop down list, but you can sometimes tweak the order with a little JavaScript/JQuery.

Here is a snippet that will move the item with a value of "721" to the end of the list and then make sure that the first item in the list is selected by default.

$( window ).load(function() {
      setTimeout(function(){
        if($("#share-the-love-drop-down").length) {

          var $select = $('#share-the-love-drop-down');
          
          $select.find('option[value="721"]').appendTo($select);
          $select.find('option:eq(1)').prop('selected', true);
          
        }
      }, 300);
});