Ariba network - Error: "Customer not entitled to create new supplier"

This is the additional information if got on https://support.ariba.com/item/view/183824

Disabling/ Enabling the CIG checkbox is not allowed if CIG is the default end point for any system ID configured in your buyer account. In this case, you need to temporarily change the default end point to some other non CIG end point for all the system IDs configured.

So my question is How to change the default end point?