By default Drupal will only display the site’s mission statement of the front page. To have your Drupal site’s mission statement displayed on all pages you’ll need to edit to files that came with the theme as follows:

Open, with a text editor, the template.php file that came with the theme. At line number 110 there is the word break; before the word break add the following line of code: $vars['custom_mission'] = variable_get('site_mission', '');

The changes should look like the following: 

$vars['custom_mission'] = variable_get('site_mission', '');
break;

Open, with a text editor, the page.tpl.php file that came with the theme. Look for the following lines of code within page.tpl.php:

<?php if ($mission): ?>
<div id="mission">
  <?php print $mission; ?>
</div>
<?php endif; ?>

Change the $mission variable to $custom_mission so that the above-mention lines of code from file page.tpl.php look like the following:

<?php if ($custom_mission): ?>
<div id="mission">
  <?php print $custom_mission; ?>
</div>
<?php endif; ?>