Thanks for those screenshots. In your current configuration, any new accounts would be set to PHP 5.6 by default unless you change them from the "inherit" value. "Inherit" just means they will take the server-wide settings from the machine and apply it to new accounts, so what you are seeing is the behavior I expect to happen.
If you want to change the version after that you can do that from the same page.
Can you let me know specifically what isn't working on that page for you?