How to dynamically change theme's slogan from admin?

Question

how can achieve this functionality. That I can change the themes "slogan" from admin and I don't have to go edit the themes source files.

I think that there is some theme options functionality. But how to use it and maybe somebody can point me to the correct path.

Added screenshot to clarify what I mean under slogan:

Answer 1

In wordpress that's a tagline..

maybe a plugin like this http://wordpress.org/extend/plugins/advanced-tagline/ can help you.

Answer 2

I just have this in my function.phpfile:

<?php
// Run the scripts for triggering the below functions
add_action('admin_menu', 'cms_options_menu');

function cms_options_menu() {
  //create new top-level menu
  add_menu_page('CMS options', __('CMS options'), 'administrator', __FILE__, 'cms_options_page',plugins_url('/images/icon.png', __FILE__));

  //call register settings function
  add_action( 'admin_init', 'register_custom_fields' );
}

function register_custom_fields() {
  //register our settings
  register_setting( 'cms-options', 'slogan' );
}

function cms_options_page() {
?>
  <form method="post" action="options.php">
    <table class="form-table">
      <tr valign="top">
        <td scope="row">
          <?php _e('Slogan'); ?>
        </td>
        <td>
          <input type="text" name="slogan" value="<?php echo get_option('slogan'); ?>" />
        </td>
      </tr>
    </table>
    <p class="submit">
      <input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
    </p>
  </form>
<?php } ?>

Then you just add whatever text you want and save the change.