When you save the configuration, the server will automatically reload it, and your rules will apply immediatly.You can check that there is no parsing error in the Prosody error log.To do so, you can read the `plugins/data/peertube-plugin-livechat/prosody/prosody.err` file, or use the [diagnostic tool](/peertube-plugin-livechat/documentation/installation/troubleshooting/) that will show last Prosody errors.