Without AD login, you won't have a Username, only that "Admin" logged in. There may be IP or MAC address info, but not a person's name you can identify.
On GUI, it shows under Administration>Admin Activities. Its shows you what "action" and on the "description" tab shows you the specific change that was made
In administrator there is no such tab, ony monitor tab there is a event tab on the left size we r using se 3000 firmware 9.13 plz send picture that would more greatful for me