If you need to choose a password there is a Unix program called mkpasswd that will help you choose a strong one.

Some examples:

mkpasswd –char=10

This will generate a 10 char random password.

You can also try:

mkpasswd -s “insertwordhere”

This will take the characters from the entered word, and create a password from those characters.
For more information see:

mkpasswd man page

You can get makepasswd from any Linux repository and there is a FreeBSD port available.