View the Audit Log by simply clicking on the sidebar menu for it. You will see a display like the one below.
Settings sidebar audit logs
Audit log view
The audit log will show you the timestamp and the type of record it is (security, schedule, etc.). Plus, you will see the username that was responsible for the audit entry and an IP address if one was gathered. Finally, you will see a descriptive message of what was being audited.
Clearing Audit Log
Clicking on the Clear Audit Log option will clear the entire audit log. This can be done to remove events that are cluttering up the view. Clearing the log always records who cleared it as the first event.