As per the blog post:
As rlparker and the instructions say, "contact our support team from the web panel". Other methods may eventually work, but there's nothing as sure-fire as explicitly and tediously following the instructions.
What are [color=#CC0000]50DISK50[/color], [color=#CC0000]3DOM50[/color], and [color=#CC0000]1IP1DOM50[/color]?
They're Dreamhost coupons!