Hi Chris,
the query that you have pasted in does not declare all necessary prefixes, e.g. rdf and skos are missing.
INSERT DATA queries can be executed from the SPARQL endpoint page (.../tbl/sparql) but not the
SPARQL Query Panel. In any case, the option to enable SPARQL is on the server administration page
under Advanced. If you don't see it there, please send a screenshot of what you get.
Regards,
Holger