Plex Media Server Update for Chrome

I am currently on a chromebook, but I also watch in Chrome on a Windows laptop.
When I use the web app, it says “Update your Plex Media Server; use one of the links below to open a server directly.”

I have uninstalled and reinstalled the web app, but it keeps giving me the same message and there are no links to click on.

Help!

Where is the server? That is what needs to be updated.