How can I present a screen that asks users to confirm their account details upon registration? I have a site for which I would like to display a "confirm details" screen when users create an account.  Basically, I would like something similar to the "required preview" option for adding a node-- just for user registration instead.

I was unable to find a module to do this.  Any ideas?
you have a function for that "function confirm_form" 

see this link https://api.drupal.org/api/drupal/modules!system!system.module/function/confirm_form/7 


2. add through js 

&lt;?php
    drupal_add_js('(function($){ $(function(){$("#edit-xxxxxx").click(function(){return confirm("confirm do that ?")});}); })(jQuery);', array('type' =&gt; 'inline'));
?&gt; 


refer the above link you will get three different ideas