Plex is so ubiquitous that installation today is trivial, but you'll need to add the repo so you can auto-update in future, and install a security key that authorises the system to fetch the update.
Step one, enable the repository to download plex and updates
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echo deb https://downloads.plex.tv/repo/deb public main | sudo tee /etc/apt/sources.list.d/plexmediaserver.list
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curl https://downloads.plex.tv/plex-keys/PlexSign.key | sudo apt-key add -
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sudo apt-get install plexmediaserver
mine is on http://192.168.1.8:32400
http:// this sets up your browser for visiting a web page.
192.168.1.8 this is an internal IP address on my home network, variations include 192.168.0.8 or 10.0.0.1 or 172.16.0.1 though the last 2 ranges are generally used for business networks.
:32400 is the default port that plex uses. Ports range from 0 to 35565. Some are reserved, :80 is the default port for websites, 443 is the default port for SSL certificates... the padlock next to a web address.