Steps you need to follow in order to rebrand default app:
Xamarin Shared project:
AtServices/Settings/AppSettings.cs may find AppSettings class, replace settings with your domain, except CurrentVersion. CurrentVersion need to be this same as set in plugin (by default is already done, if change sources of the plugin need to update here as well).
GrandNode plugin configuration
At configuration of the GrandNode plugin you may add additional parameters.