Simplified (Inaccurate) Background About OpenID
Some websites allow you instead of registering and logging-in (meaning re-entering the same information you entered before in so many other sites), to enter what is called Open ID URL, which is a URL given by a another website that you already logged in and has your information (called OpenID provider).
Once you enter the URL and continue, you get redirected to the OpenID provider confirmation page whether you want to be able to login to the new website using the same login,which gets redirected back to the new website but this time as logged in user.
If your OpenID provider is a popular provider, like Yahoo or Google or so, some websites will give you a shortcut to writing the URL at login by just selecting the provider from a predefined list of providers in the login page. If your provider is not in the list, or the website does not offer any shortcut list at all, you should be able to know your OpenID URL to enter same as you know your User ID or so.
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