Add a popup text link to a specific "create content" page
Have you considered hook_form_alter and the usage of either of these 2 modules:

BeautyTips, which allows:


  The Beautytips module provides ballon-help style tooltips for any page
  element by integrating the BeautyTips jQuery Tooltip plugin by Jeff
  Robbins with Drupal. It provides an API for adding custom beautytips
  as well as some built-in features. Admins can enable rollover
  balloon-help style tooltips for text fields within forms. It also
  supplies hover tips for Drupal help links and advanced help links.
  
  Most importantly, it allows developers to add their own custom
  beautytips popups to their site without having to delve into jQuery.


Guided Tours, which allows:


  Gives content creators the ability to build tours on their sites which
  allow users to better understand complex workflows on the site and be
  guided through those workflows. The main advantage of this module is
  that you can build tours leading the user through multiple different
  pages with multiple tooltips on one page/step. This module uses qTip
  and jgrowl_d7.


EDIT

As an example for /node/add/page the recipe would be:


Implement hook_form_alter in a custom module for this pages $form.
For any form item of the form you want to add a beauty tip for add a class so you can find it easily using beauty tips.
For instance then at the end of your hook_form_alter function you then can add the beauty tips calls following the documentation. You can use your helper CSS classes to make your life somewhat easier.
repeat (1) thru (3) as necessary ...

# in file mymodule.module

// This is step #1.
function MYMODULE_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  // This is step #1. Or target 'page_node_form', or use a Regex for certain forms.
  if ($form_id == 'student_blog_node_form') {
    // This is step #2. See https://api.drupal.org/api/drupal/developer!topics!forms_api_reference.html/7#attributes 
    $form['field_survey_program']['#attributes']['class'][] = 'my-beauty-tip';
  }

  // This is step #3. See: http://cgit.drupalcode.org/beautytips/tree/README.txt?id=HEAD
  $options['bt_drupal_help_page'] = array(
      // what selects the content from the page using css selectors.
      'cssSelect' =&gt; '.my-beauty-tip',
      // what to show in the tooltip.
      'text' =&gt; 'This is my tooltip!',
      'trigger' =&gt; array(0 =&gt; 'mouseover', 1 =&gt; 'click'),
      'width' =&gt; 350,
    );
    beautytips_add_beautytips($options);
}