How to properly name tpl file for webform-submission-navigation.tpl.php?
Copy webform-submission-navigation.tpl.php to your active theme templates directory
Clear Drupal Cache
Add a php condition in above tpl to render your link only for node 139


Code you need to use in above tpl...

&lt;?php
 if ($node-&gt;nid == 139) {
    print l('You Link Title', 'link/path');
 }
?&gt;