Why i cant use the domain appgyverapp on my webapp?

I cant use the appgyverapp domain on my webapp what should i do? i dont have a domain, and i dont know how i can get one to show my cliente his webapp. Please i need help

The webapp host from Appgyver was deprecated in march this year, but you can host it on Github.

You can see more information in the post bellow

https://forums.appgyver.com/t/deploying-your-appgyver-web-build-for-free/20140