Hi, what version of Guvnor and jBPM Designer are you using? This blog might help you get started: http://surdilovic.wordpress.com/2012/04/10/jbpm-designer-version-2-1-released/
And this link: http://www.jboss.org/jbpm/components/designer
And docs: http://docs.jboss.org/jbpm/v5.3/userguide/ch.designer.html
HTH
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