First off, I'm assuming you are talking about the Android Olympus application, right? (Cause there are similar applications for iOS and Web)
On (1):
May I ask where you got the ip 22.23.228.238? Our old demo instance used to be at 23.23.228.238 (not 22.23.228.238), but it's no longer used.
Also, the Olympus Android application should work out of the box, that is without setting a Domain at all (it would be working on registrar-less mode) but still be able to make calls our Restcomm Cloud instance (cloud.restcomm.com)
If you definitely need to register then I'd suggest that you setup your own Restcomm instance using docker, which should be a snap to get you started. Here's a guide for this:
http://www.telestax.com/rapid-webrtc-application-development-with-restcomm-and-docker/
On (2):
I think there's hint showing up there when the fields are empty to guide you. In any case for 'Name' you can use any type of identifier string, like 'Conference Restcomm App' and in the 'SIP' field you add a SIP URI, like: 'sip:+1235@cloud.restcomm.com'
Hope this helps.
Best regards,
Antonis