hi~ I sent Alarm Message to Smart Client.and than, I checked the Message in alarm list.But, I could not change Alarm state.How can I change Alarm state?And also, How can I add Alarm Manager?

I am not sure which version you are using now but Alarm manager isn’t supported when you use essential plus. Please see this comparison chart;

https://content.milestonesys.com/media/?mediaId=03F1B94C-5A2B-4031-870A431B57382C4D