viewers register for website

I heard there used to be a form that people could use to register (using their email address) for feedback when new articles are added to my site. Does that form still exist and where do I find it?? Anything special I need to know to set it up??

Thank you for your time and help.

My site is……
http://blog.mommawolfzpack.com

[No bumping. If it’s that urgent, consider hiring someone.]