Ok, first let me apologize in advance for my very limited knowledge on tech issues. I’m in my mid 50’s so learning new things is a challenge, and you’re probably going to find my quite annoying. If you do, have no fear, I do not take offense, and if I had to deal with me, I’d probably punch me in less than 5 minutes. And this is still me, in my last attempt last night, I went and deleted all my accounts, made this brand new account, and turned off all other computers in my house, removing them from my w-fi network. So the movie server computer is the only one running and connected to the internet right now.
Now, I followed everything you said step by step. I installed the clean copy of Plex media server. It is installed on the same machine my movie and tv shows are stored on. And as I said, it’s the only computer on and connected right now.
After it installed, I launched it, and opened it up. It opened in my Microsoft Edge browser, and it opened to
“[ Plex]( http ://127.0.0.1:32400/web/index.html#!/setup/19f17cd87522b3fc7cc960351c0dd4e1ff942f81)”
This gave me a page that said "Not Found We can’t find the page you’re looking for and right under that, a link that says “Go Home”. Clicking that link took me to my home page, which is:
“[ Plex]( http ://127.0.0.1:32400/web/index.html#!/)”
Since Plex is installed on the same machine all my media is on, I stayed there because that’s what you said to do.
On that page, I get the left menu with Home, Live TV, Movies & Shows, Web Shows, podcasts, and music.
When I set up up the very first time, there was a + sign under that, to add my own media, but that is not there now. In the main window, I have all the selections for those categories that are loaded through plex. None of them are media that is located on my system.
If I open settings, I do not have the “Manage Libraries” section on the left side menu to add new media. The only sections I have on that left side menu in settings is:
“gnzsrvr @ gmail.com”
Account
Online media Sources
Authorized Devices
Webhooks
Users & Sharing
Plex Web
General
Player
That is all that there is on that left menu. I don’t have the “Manage libraries” section at all, so I am unable to add new media folders.
Now, you said if my old server is still connected to my account and I want it gone, to delete it’s record from the list of Authorized Devices.
I don’t know if it’s connected or not. As I said, I deleted all 3 of my old accounts, and am using this single brand new accont. But in my Authorized Devices, it only shows 3 instances of Microsoft Edge. Just the blue “e” buttons.
One says
4.66.1 21 minutes ago
Plex Web
Windows
Second says:
4.66.1 22 minutes ago
Plex Web
Windows
Third says:
4.72.0 23 minutes ago
Plex Web
Windows
I don’t see anywhere that mentions anything about authorized devices records, but there are red x’s on the top right corner of each of those 3 where I can remove them. But I have no idea if they are for my current one or my old server.
Is there any way I can just wipe everything out completely and start the whole process from scratch like I had never even installed this before? I think that would make the whole process much easier.
Thanks for all your help and patience so far, and thanks in advance for any help and advice you can continue to provide until my “noobishness” has pushed you to your tolerance limits. 
Very much appreciate your time and assistance.
Conzo
Edit: The URL’s I posted to show what pages opened in plex, I went pack and stuck in a couple random spaces, because they kept displaying as a link, and would not show the text in the URL otherwise.
And I tried the same steps above connecting it to my local IP address, even though I’m not on a machine that does not contain my media files, and I get the exact same results as above.