OS X V10.6 Snow Leopard :: Adding Text To Pdf?

I'm trying to fill out a downloaded application which is in pdf format.  I can type text onto the form in Preview, however, the text types as though it's right justified.  That is: when I type the text, the text appears to the left of the cursor.  To clarify, the cursor stays in the same place and the text moves to the left, for example, when I place the cursor to the right of "Name", the text I type in appears to the left of the cursor on top of the word "Name".  For fields such as Name and Date, I suppose I can just put the cursor far to the right and type my text, but this is an application that includes an essay portion.  Typing a paragraph with all of the text going to the left of the cursor isn't going to work very well.  Is there a way to change the way the text is added, so that it's added in a more normal way, like the way I'm typing this question, where the letters appear where the cursor is and the cursor moves to the right as you add more text?   

I have also tried doing this in Text Edit and Pages (I converted the pdf in Text Edit to rtf), but I wasn't able to fill out the document as needed.  In addition, importing the document to Pages and Text Edit, for some reason, only imported the first page of the document).  I am using OS 10.6.8