Read more link

How can I change the elipises (…) on excerpts into Read more links

I have tried including the following code

function excerpt_ellipse($text) {
   return str_replace('[...]', ' <a href="'.get_permalink().'">Click here to read more</a>', $text); }
add_filter('the_excerpt', 'excerpt_ellipse');

into the functions.php but it is not working, am I doing something wrong?

Here is a link to my website calnelions.org