You can activate a module using:
Module module = ContactBookModule.shared();
Modules can also be configured:
Module module = FirebaseNearbyUsersModule.builder()
.setMaxDistance(100)
.build();
Modules can be added during Chat SDK initilization:
ChatSDK.builder()
...
.build()
.addModule(module)
...
Or if you're using quick start:
ChatSDKFirebase.quickStart(..., module);