Replacefeedback@yourdomain.comwith you own email address.
ReplaceFeedback form with you own subject line (this can be any text you like).
ReplaceValues submitted from web site form with you own text (this can be any text you like).
Did you follow my steps exactly as I wrote them?
Looking at your page I'm missing confirm.php, so you missed at least two important steps (12 and 13).
www.myhomesweethome.com.au/registerapi.htm looks fine, so now concentrate on the confirm page, do not forget to set the file extension to php (step 13)
And of course make sure the PHP code is on the correct place in the webpage.