The instructions for using the plug in are not clear. What do you mean by transition? Where is this supposed to be enabled? Please document the enabling of the plug in better.
A transition is a workflow transition: https://confluence.atlassian.com/display/JIRA/Configuring+Workflow#ConfiguringWorkflow-Workingwithtransitions
For HipChat notification, you need to add a post function: https://confluence.atlassian.com/display/JIRA/Configuring+Workflow#ConfiguringWorkflow-Applyingpostfunctionstotransitions
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