Those instructions will get you started to use your Koumbit OpenID on any site supporting OpenID.
OpenID is a system allowing you to use the same username and password across multiple sites. A more thorough introduction is available on OpenID.net.
This site is Koumbit's OpenID provider and it provides you with an OpenID URL you can use on every OpenID site. For Koumbit, it is particularly interesting since it will allow you to use the same OpenID URL for all Drupals.