synchronization Module: How to stop

Hello, I am trying to stop synchronization module. I am following the instructions in this page:

https://wiki.openmrs.org/display/docs/Sync+Module

The instructions are easy. But I didnt know where or how to do this step: 1- Set the sync.mandatory module to false.

I appreciate your help in this regards

Did you try this page? http://demo.openmrs.org/openmrs/admin/maintenance/globalProps.form