Creating nobody user so website visitors can update records

I got the following error message when testing my first postgresql web page:

Warning: PostgresSQL query failed: WARN:counter: Permission denied. in
/home/ez4gl/public_html/index.phtml on line 15

However, at the psql prompt I am able to execute the very same query that
resulted in the above, so I presume it has to do with the user "nobody"
accessing the web page.

I would appreciate instructions on how to set up the nobody user and give
nobody the appropriate permissions so I can pass them along to my web host,
as I don't have postmaster or superuser status to do it myself, and I need
to spoon feed it to my web host so he won't keep trying to push mySQL on me.

Thanks in advance

George Jempty