I managed to add the extension, but will not allow me to apply change.
Kee getting message saying unable to save changes due to code being locked to a template, any ideas where the code is added to, i thought it would be the form itself which resides in an editable region of my page.
I'm not familiar with the Extension to which you refer, but my guess is that it needs to write code to the <head> of your document. If you're using DW Templates to generate pages, your Template's <head> tag needs to be editable.
<!-- TemplateBeginEditable name="head" -->
<!-- TemplateEndEditable -->