Adding default text to input field I was needing to add a default value to a text field that disappears when you click on the field.  

I did found this question :

How to add default text that clears on focus to a form in Drupal?

However, my knowledge is pretty limited as far as creating hooks so I'm a little lost as to the solution being drawup up here.

Could someone please point me in the right direct?

Cheers!
Since this is 2014 you're probably looking for the placeholder attribute, and not an old-school javascript solution.

Broad strokes: Implement hook_form_alter() and add the attribute there:

function MYMODULE_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  if ($form_id == 'foo') {
    $form['bar']['#attributes']['placeholder'] = t('Baz');
  }
}