Hello, dear!
First, you need to use the administrator account to log in to the device web interface.
In the navigation tree on the left, choose System Tools > User Log. In the pane on the right, click Download log File. In the dialog box that is displayed, click Save, specify the path of saving the log file, and save the file to the local disk.

Select Save Log to enable the log saving function in the system.
You cannot configure Log Level, which indicates the level of the saved log. The log whose level is equal to or higher than the debug-level log is saved.
Click Download Log File. In the dialog box that is displayed, click Save, specify the path for saving the log file, and save the log file to the local disk.
Thanks!