Shared users? one domain, two blogs, two databases

Hi, I”m not a programer and barely understand sql and php admin so I’m a bit lost. I have godaddy and two blogs on the exact same domain, one is in the root, the other is a subfolder. I used godaddy to install my wordpress.

I am trying to find a plugin that allows me to share the users between both without having to figure out how to share my database tables. I do know my database names though (barely lol)…

Does anyone know how to help me in a simple way? Everything I’m finding is about when there is a shared database.