Hello Sean,
This can be done from the cli command prompt as so for user (bob):
[root@ACS6000-Bench ~]# cli
cli-->cd /users/local_accounts/user_names/bob
bob cli-->set password_change_at_next_login=yes
bob cli-->commit
bob cli-->shell
[root@ACS6000-Bench ~]#
Best regards,
Stefan Liedtke