How to remove an old server in plex Server name

Plex Media Server Metadata & Adding Files
1

Server Version#:
Player Version#:
When I log into plex it shows a ds 918 server which I would like to delete. I reinstalled my ds and my new plex server is named Diskstation 918. How do I delete the ds 918 server. Thanks for anyone’s help.

2

Setttings - Authorized Devices - Servers (it’s a drop down)

You can now see all the defined servers.

REMOVE that which you no longer have