When enabled, your own guest names list will be used to automatically assign names to auto-logged Guests. Disable it if you want to let Chatwee assign guest names like 'Guest Johnny' automatically.
When the Set my own guest names list is checked, the additional button, labeled Edit user names list appears. When you click on the button, a text field containing current guest usernames appears ready for editing. For instance, you can replace the default guest names convention with numbers (e.g 001, 007, 057, etc.).