The Settings page requires that you login, which only requires an email address.
The quick action bar on the search results page also has a smaller cog icon and other icons on it that will allow you to change several settings without logging in, but you must have javascript enabled to access them.
The quick action bar on the search results page also has a smaller cog icon and other icons on it that will allow you to change several settings without logging in, but you must have javascript enabled to access them.