WordPress user registration and Newsletter plugin integration…

Hi there. I am wanting to take the area of my site where people can register (the regular registration area automatically on WordPress sites), and integrate it with my newsletter pugin. Basically I just want to have one place where people can sign up for the whole thing or just part of it. I won’t be back to check this thread for a few hours, but please let me know.

My website is https://www.heartcenter333.com

Maybe you have a better idea for me, I haven’t had anyone sign up on my newsletter plugin yet, so I can take it off and go a different route. Thanks for any help