From JC2-MP Documentation
Scripts should be installed to scripts/. They are automatically loaded on server startup. You can reload a script using the reload console command, such as reload nametags.
If you are installing a script named AwesomeScript, the resulting directory structure should look similar to the following:
The server/, client/, and shared/ directories may contain .lua files, but none are required; nametags only uses the client directory, for instance.
The server may come with a default_scripts directory, which contains some useful and common scripts, such as nametags. You can also find updated scripts on the official GitHub page . You will need to either rename the default_scripts/ directory or copy the contents into the scripts/ directory.