1. Backup the original files before making any changes.
2. Open the file wp-content/themes/event-manager/single-sc-speakers.php
3. Look for the line:
echo ‘<p>’ . get_the_post_thumbnail( $post->ID, ‘sc_thumbnail’ ) . ‘</p>’;
4. Below that add the following code:
$url = esc_url( get_post_meta( $post->ID, ‘sc_speaker_url’, true ) ); 
if( !empty( $url ) ) echo ‘<h4><a href=”‘ . $url . ‘” target=”_blank”>’ . $url . ‘</a></h4>’; 
$twitter = esc_attr( get_post_meta( $post->ID, ‘sc_speaker_twitter’, true ) ); 
if( !empty( $twitter ) ) echo ‘<p><a href=”http://www.twitter.com/’; . $twitter . ‘” target=”_blank”>@’ . $twitter . ‘</a>
5. Your new code should now look like:
function sc_speaker_single_image() { 
global $post; 
if( has_post_thumbnail() ) 
echo ‘<p>’ . get_the_post_thumbnail( $post->ID, ‘sc_thumbnail’ ) . ‘</p>’; 
$url = esc_url( get_post_meta( $post->ID, ‘sc_speaker_url’, true ) ); 
if( !empty( $url ) ) echo ‘<h4><a href=”‘ . $url . ‘” target=”_blank”>’ . $url . ‘</a></h4>’; 
$twitter = esc_attr( get_post_meta( $post->ID, ‘sc_speaker_twitter’, true ) ); 
if( !empty( $twitter ) ) echo ‘<p><a href=”http://www.twitter.com/’; . $twitter . ‘” target=”_blank”>@’ . $twitter . ‘</a></p>’; 
}
6. Update the file.
