The IBM i OS lets you track a lot of different system security events and you can explore all of these in the OS Security Reference manual. For our purposes, however, all we're looking at it how to set up security auditing for an individual user.
To start security audit journaling, you can use the IBM i CHGSECAUD. For our purposes, you can use the following command:
CHGSECAUD QAUDCTL(*OBJAUD *NOQTEMP *AUDLVL)
If your audit journal does not exist, this command will set up the journal receiver and create the system audit journal. Two system values will also be updated.
In IBM i Navigator
Use "Auditing Configuration" under "Audit Journal" in the "Security" menu.