On the https://hrdlms.net homepage, log in with the training center administrator ID, create a course and a semester opening, and then register a beacon for the semester opening. After students belonging to that class log in and there is a registered beacon nearby, a blue icon will appear at the top right of the app and attendance can be confirmed by pressing the class button corresponding to the time. If the beacon does not exist, the blue icon in the upper right corner of the app will not be visible, and when you click the corresponding teaching button, a message will appear indicating that attendance has failed.