Added missing step for config Syslog

Author: MGoedtel

articles/azure-monitor/platform/data-sources-syslog.md

@@ -44,7 +44,7 @@ The Log Analytics agent for Linux will only collect events with the facilities a
 ### Configure Syslog in the Azure portal
 Configure Syslog from the [Data menu in Advanced Settings](agent-data-sources.md#configuring-data-sources). This configuration is delivered to the configuration file on each Linux agent.
 
-You can add a new facility by typing in its name and clicking **+**. For each facility, only messages with the selected severities will be collected.  Check the severities for the particular facility that you want to collect. You cannot provide any additional criteria to filter messages.
+You can add a new facility by first selecting the option **Apply below configuration to my machines** and then typing in its name and clicking **+**. For each facility, only messages with the selected severities will be collected.  Check the severities for the particular facility that you want to collect. You cannot provide any additional criteria to filter messages.
 
 ![Configure Syslog](media/data-sources-syslog/configure.png)