hi Harley,
that line is basically showing you that you can add Additional Attributes via PowerShell, you just need to define them,
try it in a lab first and you'll see they get set correctly, then adjust for production use and do the same thing
good luck !
cheers
niall
as regards part 8, that's all about time and things, right now i focus on work and 'releases' from Microsoft, when they release something that i should blog about, i do (for example the MBAM stuff in TP1909)