How to modify the "Send Message To" URL for IE in RWB

Dear ALL,

How to modify the "Send Message To" URL in the Integration Engine / test message tab on Runtime workbench.

The XI server is setup new and when i run a small file2file scenario to test the complete installation the above mentioned URL is not confiured properly.

Pls suggest how to update this URL.

Regards,

Nandini.