MII Configuration for Novice - Trigger sample message out of MII to Test connection

Hi MII Experts,

I am new to SAP MII and I have been asked to trigger a test/sample message from SAP MII to SAP PI to check if the connectivity is working fine or not.

I started off by following the link - Message Listeners - Message Services - SAP Library

By following that,  I have configured a Message Processing Rule using a Listener XMIIMESSAGELISTENER to send the message out of SAP MII.

I am unable to figure out where to post the XML document and trigger it.

I am also unable to interpret the actual meaning of the statement -

"To have the message listener queue and process an XML document, you post the XML document to the WSMessageListener service. The  Nameproperty maps to the  Message Nameproperty in the Message Processing Rules screen.

Post the XML document in the body of the message to the URL: http://<server>:<port>/XMII/Illuminator?service=WSMessageListener&mode=WSMessageListenerServer&NAME=<UniqueMessageName>"

I request kindly guide me in this regard.

Thanks,

Arkesh