I give up; how do I do a service changed?

The documentation is VERY difficult to search. A search only goes over the chapter. I get different results depending upon which one I am in .... aarrg! And there are SOOO many.

So I want to do something very basic; 

On my peripheral I want to expose the service changed characteristic. That appears to be done by default because I see it on my central. But now I try to enable indications from the central and it fails. Well of course it does! I need to handle the BLE_GATTS_EVT_WRITE event!

So I do and come across a MAJOR difficulty. I need to have the handle of the Service Changed Characteristic. But there is no way to get it; or at least I cannot find a way to get it.

So how can I get the handle of the service changed characteristic so I can deal with it in the BLE_GATTS_EVT_WRITE event?