To use the buildin test data:
Open public/index.html
Install an endpoint, i.e. jena-fuseki (http://jena.apache.org/download/index.html)
Import graph data to the endpoint
Modify query request in public/seres-run.js (line 2) to:
var json = query.execute(queryString, host, output, stylesheet)
i.e.:
var json = query.execute('construct where {?a ?s ?b}', 'http://localhost:3030/ds/query?', 'json');
Then just:
Open public/index.html