Hi there,
In order for you to fetch those customs field on your site, you required to call it "Unique Key" as you can see here
http://take.ms/1OD1m. Then you can can call them using codes below.
[gist type="php"]
//for example i am using 'TEXTBOX-1'
<?php echo $user->getFieldValue('TEXTBOX-1')->toDisplay('listing', true); ?>
[/gist]
Hope this helps