You will be prompted to enter your password when you first logon after entering the setup command.
Type
setupat the prompt.Enter your current password.
Enter your new password.
Note
Pressing Enter will retain your current password. If you enter a new password you will be asked to confirm the password.
Note
If two entries of the password entered does not match or the password is not of minimum length of 8 characters, you will be brought back to the prompt.