Fetch the login and password of your PostgreSQL admin user.

Edit the /etc/vhffs/vhffs.conf file with those values

      # Configuration for pgsql
      <pgsql>
              # Use this module or not
              activate        =       yes

              # Parameters used to connect to PostgresSQL server as admin
              host            =       localhost
              username        =       vhffs
              password        =       ********

              # Complete path to the pgdump binary
              pgdump_path     =       /usr/bin/pg_dump

              # URL to phppgadmin
              url_phppgadmin  =       http://phppgadmin.hoster

              # URL to the documentation (optional)
              url_doc         =       http://help.myhoster.net/pgsql
      </pgsql>

Users can now ask to create PostgresSQL databases using the panel.