I think this section:
"Assuming you are the next of kin/legal guardian.
Hospital issues Death Certificate. (Body taken to the morgue.)
Death Certificate has to be take to City Hall (to be authenticated or something).
Death Certificate and passport of the deceased taken to national Embassy. (Passport is cancelled. Get Death Certificate translated and notarized copies made.)
Embassy issues Letter authorizing disposal of the body.
With copies of the Death Certificate and Letter from the Embassy, make an appointment at whichever temple you like for a cremation ceremony.
Make arrangements to move the body from the morgue to the temple on the appropriate day. "
might depend on which country you are a citizen of as this certainly wasn't the case when a friend of mine died a few years ago and his Thai wife asked me to contact our embassy to find out what she had to do and whether they were even interested. The answer was that unless the body was to be re-patriated to our country they, the embassy, were not at all interested.