How to output the fields i defined in terms?

The way I find easiest to do this is via the Views module.

Say, for example, you define a new field called "header" for a vocab. In the View you have for taxonomy/term, go to the page view and expand the Header section.

In there you need to set the input filter to PHP and enter something like the following into the box (including the <php and ?>)...

  $t = taxonomy_get_term(arg(2));
  taxonomy_enhancer_extend_term($t);
  echo $t->my_header_field_id;

Does this help?

I need some more help with this, i am not adding it in a view, but rather page-catalog.tpl.php where catalog is my vocab (ubercart)

I created a field called catalogtitle to enbed a field to be used for the Page Title.
In my tpl file i put the following. This is not outputting anything. Am I missing or not seeing something?

<title>
<?php
  $t = taxonomy_get_term(arg(2));
  taxonomy_enhancer_extend_term($t);
  echo $t->catalogtitle;
?>
</title>

Thanks