Server PMs are the chat tabs that appear on login.

Updating the server PMs first requires remote access to the server. Use the Prime folder shortcut or navigate to:

C:\AMPDatastore\Instances\TestWurm101\wurm-unlimited\402370\mods\scriptrunner\scripts\onPlayerLogin

Edit the greet.js file. Adjust the text within, taking care not to remove any quotes or semicolons from the code. Save the file. The update will take effect on next server restart.