Reply To: Add/Modify "Read More" Button

To use the excerpt go into your page_portfolio.php file and change this –

/** Customize the read more link */
add_filter( 'get_the_content_more_link', 'custom_read_more_link' );
function custom_read_more_link() {
return '... <a class="more-link" href="' . get_permalink() . '" rel="nofollow">Read More</a>';
}

To this –

/** Customize the read more link */
add_filter( 'excerpt_more', 'custom_read_more_link' );
add_filter( 'get_the_content_more_link', 'custom_read_more_link' );
add_filter( 'the_content_more_link', 'custom_read_more_link' );
function custom_read_more_link() {
return '... <a class="more-link" href="' . get_permalink() . '" rel="nofollow">Read More</a>';
}