How new users register on my site when I don't…

Hi, I recently created a new website, www.DrGinseng.net. I don't have any widget to register or join in my website. However, people continue to join my site, "via p3nlwpweb200.prod.phx3.secureserver.net " My question is "how do they join in my website?" And is this normal? Please let me know. I really wonder. Thank you for your time.