Thank you @illusionglass and @riteshpatel and for your help. Putting your suggestions together, this is what I got so far:
- 
I copy /wp-content/plugins/buddypress-media/templates/  directory to my twentytwelve-child directory 
- 
I rename this directory to obtain: mysite/themes/twentytwelve-child/buddypress-media/templates 
- 
I looked at the file media/media-single.php and found this code where rtmedia_permalink() is mentioned: 
   <div class="rtmedia-media-name <?php if(
rtmedia_album_name() ) { ?>rtmedia-media-name-width-50<?php }
else { ?>rtmedia-media-name-width-100<?php } ?>">
       <a href="<?php echo rtmedia_permalink();?>"
title="<?php echo rtmedia_title (); ?>"><?php
echo rtmedia_title (); ?>
   </div>
                
   <?php if( rtmedia_album_name() ) { ?>
                
       <div class="rtmedia-album-name">
                
           <span> <?php echo __( "under",
‘rtmedia’ ); ?>
           <a href="<?php echo
rtmedia_album_permalink();?>" title="<?php echo
rtmedia_album_name(); ?>"><?php echo
rtmedia_album_name(); ?>
       </div>
                
   <?php } ?>
   
- What do I do now? Sorry to be such a beginner.
@riteshpatel, when I right click, I do not see “Copy Image URL” in the list of options. But also, I am not looking for an image url, but for a page since I want to direct my users to this page so that they can comment.
I am grateful for any further help you can provide.
Thanks