“Conflict” with jQuery (or its plugins)?

You can use $ but it is advised you don’t. Use jQuery or something like the example in your link, if you must use $ you can do so like this;

$.noConflict();
jQuery(document).ready(function($) {
    // $() will work as an alias for jQuery() inside of this function
});
   //$ will cause problems if put here:)

To use it for just a function you can append jQuery to the end like:

(function($) {
    // $() will work as an alias for jQuery() 
})(jQuery);  //dont forget this part