OnClick Event not Captured
You shouldn't be adding JQuery like that.  It's automatically included in core, so you don't need to include it yourself.  To stay up with the latest JQuery version, install the jQuery Update module.

For your JS file, this should work:

(function ($) {
    Drupal.behaviors.myid.registrar_button = {
        attach: function (context, settings) {
            $('#myid_registrar_button').on('click', function(e) {
                e.preventDefault(); 
                alert("Eww");             
            }); 
        }
    };
})(jQuery);