Admin Audit Log is one of the server administration windows. Open it from File > Admin; it opens as a desktop window you can drag, resize, minimize to the taskbar, and close with its title-bar X.
Reading the log
The window reads /admin log as a point-in-time snapshot — it does not follow new entries. Last bounds how many rows come back, and User narrows it to one admin. Leaving Last blank falls back to 20 rather than asking for everything.
Access
Only server administrators may refresh. The window is read-only for everyone: there is nothing here to change.