Joomshopping client list in back end, how can I add additional field 3?

Joomshopping client list in back end, how can I add additional field 3?

Hello,
I have Joomshopping,
I need to add the column additional field 3 in the back end in the list of clients

I added the following code in the file
\administrator\components\com_jshopping\views\users\tmpl\list.php

<th>
<?php echo JHTML::_('grid.sort', _JSHOP_EXT_FIELD_3, 'ext_field_3', $this->filter_order_Dir, $this->filter_order)?>
</th>


<td>
<?php echo $row->ext_field_3;?>
</td>


But it only shows the title and not the values for each user

Can you help me please?
Thanks

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Aw: Joomshopping client list in back end, how can I add additional field 3?

Change DB Query

administrator\components\com_jshopping\models\users.php

Add in query
,U.ext_field_3