1. Go to function.php
2. Add this set of code to it.
// Replaces the excerpt "more" text by a link
add_filter('excerpt_more', 'new_excerpt_more');
function new_excerpt_more($more) {
global $post;
return '<a class="moretag" href="'. get_permalink($post->ID) . '"> Read More...</a>';
}
3. The code above is using the words: Read More...
4. If you like to use other wording, you just replace Read More... to any wording of your choice.
5. Click Update File button.
* Read where to add code to php file.
*How To Customize The Number Of Words In Excerpt.