HELP–where did the templates directory go?

Thanks Sakin. I read the instructions but I still don’t understand what to do with the custom php files that our site uses. I copied one of the below. Should the contents of that file be copy and pasted into functions.php or does it go somewhere else and if so, where?

filename: pdf-record-custom.php

<?php
/*
 * default template for the [pdb_record] shortcode for editing a record on the frontend
 *
 * this template uses a table to format the form
 * 
 * @version Participants Database 1.6
 */
?>
<div class="wrap <?php echo $this->wrap_class ?>">

  <?php
  /*
   * as of version 1.6 this template can handle the display when no record is found
   * 
   * 
   */
  if (!empty($this->participant_id)) : 
    
  ?>

  <?php // output any validation errors
 $this->print_errors(); ?>
  
  <?php // print the form header
  $this->print_form_head()
  ?>
  
  <?php while ($this->have_groups()) : $this->the_group(); ?>
    <?php $this->group->print_title() ?>
    <?php $this->group->print_description() ?>

    
    <table  class="form-table">
      
      <tbody class="field-group field-group-<?php echo $this->group->name ?>">

      <?php
      // step through the fields in the current group
      
        while ($this->have_fields()) : $this->the_field();
          ?>
      
      <tr class="<?php $this->field->print_element_class() ?>">
      
        <th for="<?php $this->field->print_element_id() ?>"><?php $this->field->print_label() ?></th>
        <td>
                  
              <?php if ($this->field->has_help_text()) : ?>
          <span class="helptext"><?php $this->field->print_help_text() ?></span>
          <?php endif ?>
          <?php $this->field->print_element_with_id(); ?>
          
        </td>
        
      </tr>
      
      <?php endwhile; // field loop ?>
      
      </tbody>

    </table>
    
  <?php endwhile; // group loop ?>
    <table class="form-table">
      
    <tbody class="field-group field-group-submit">

      <tr>
        <th><h3><?php $this->print_save_changes_label() ?></h3></th>
        <td class="submit-buttons">
          <?php $this->print_submit_button('button-primary'); // you can specify a class for the button, second parameter sets button text ?>
        </td>
      </tr>
      
    </tbody>

    </table><!-- end group -->
  
  <?php $this->print_form_close() ?>
  
    <?php else : ?>
    
    <?php 
    /*
     * this part of the template is used if no record is found
     */
    echo empty(Participants_Db::$plugin_options['no_record_error_message']) ? '' : '<p class="alert alert-error">' . Participants_Db::plugin_setting('no_record_error_message') . '</p>'; 
    ?>
    
    <?php endif ?>
  
</div>