My Plex Media Server is not on the Authorized Devices list

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Please help. When I tried to make a fresh start with Plex server on my Windows, I accidentally deleted the Plex Media Server from the Authorized Devices list. I reinstall Plex Media Server. I can reach my account on web, but when I try to add media I’m asked to install the Plex Media Server (which is running) and it still isn’t in the Authorized Devices list. How can I connect the server to my account?

Thanks to the answer. In my case the solution was right-clicking to the PMS icon on the system media tray and select Run Plex. This automatically restored the connectoin.