3242446 - How do I add the Additional participant element to a BPMN diagram?

I have a simple BPMN diagram under construction and I would like to add additional participant to a task. Where can I find that type of element? 

Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.

Please take a look at the left side of the editor window. At the top there should be a possibility for choosing the shape repository. Please change to "BPMN (Complete)":

KBA , BPI-SIG-PM-MOD-EDT , Graphical Editor for SAP Signavio Process Manager , How To

SAP Signavio Process Manager all versions ; Signavio Process Manager all versions