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I'll assume here you've a working installation of Mondrian (whether with the preconfigured install of Pentaho, or what-have-you).
First, visit http://mondrian.pentaho.org/document...stallation.php the Mondrian installation documentation. Near the top is a section entitled "2 Set up test data in a non-embedded database". Do whatever is necessary to get that test dataset setup (this is the 'foodmart' database. If you got the PCI, or otherwise are using the pentaho demo, more than likely you don't already have this setup -- you'd probably know if you did). If you have trouble getting the foodmart database loaded, check this bug and see if the suggestions there work for you: http://jira.pentaho.org/browse/BISERVER-917.
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