The guide doesn't show it but I found the way to do it. I need to click the search button then click export and it will give me the file. Thanks everyone for the help.
I have successfully registered tm.30 and an email was sent to me that it was approved but I have been stuck for quite some time looking how to print out the receipt
Thank you now I understand. Maybe they misunderstood and only saw the old extension they gave and not the one from cambodia because the stamps on my passport is a mess and not really in order