The GitHub connection is not there in the UK (Eu-West1). Honestly, I’ve never used it.
But you can look here:
Yes, the add device page looks the same. And if you are trying to add the Device, then you first need to add the two custom Device Handlers first in the My Device Handler section on the top.
To add the IP, you need to edit the settings part and not the Device itself. Either click on the small edit link in the left column in the IDE device page, or in the app, when you look at the device click on the cog wheel and for the settings or the … in the top right and settings in the new app. If the settings is not there just click somewhere else and click again on the … on the top right and it will list the settings.