Well it should work with subdomains, but in a different way. When you create a subdomain 'sub', a folder called 'sub' should automatically be created in public_html. Both of the following urls are supposed to load, but only the latter can be used here to install Mys v1.1.0:
sub.yourdomain.com
yourdomain.com/sub
If the folder 'neon' exists on your site, you should enter
www.planetkalzy.com as your domain and script path to be /neon/adoptables.