Move WPMU to server root directory - update initial setup

While setting up my WPMU multisite, I was within a subdirectory of the root two levels into my server. Now when logging into the Network Admin site, all my WMPU files are within the first directory which I started, not within my root. How do I move the MPMU files one level up to my root directory, so that everything works as it's supposed to? Currently, when I want to add another Wordpress website to WPMU, it always asks me to add it to the first site. Here are the details:

1. root/minihahas/wordpress > where I created my first WPMU site

2. All the WPMU file went here: root/minihahas

3. Where I want the WPMU files to go: root