mrtg-mysql-load needs access to the mysqladmin, which you
should have installed (try running it from the command prompt).
Copy the Perl script mrtg-mysql-load to wherever you keep your
other scripts for MRTG.
Check the first line in mrtg-mysql-load, and change the path
to wherever Perl is located on your machine (use 'which perl' at
the command prompt to find out where it's at).
Establish a Target using mrtg-mysql-load in the MRTG
configuration file. The file mrtg-cfg.example explains things