The Log Viewer allows the Site Administrator to view a history of the database events such as account login, access errors, introduced modifications, module and page changes, user account activities, security role activities, etc. The 100 most recently logged events are displayed by default. Such visualizations can be filtered in order to check only some events.
In order to proceed with the view you need, when logged in as an administrator, to click the Log Viewer in the menu. The following dialog box will be displayed: