Where to get notification for expunged usernames isn't documented
As seen on http://www.livejournal.com/misc/expunged_list.bml, the page says "Waiting for a particular deleted username? Sign up to receive a notification once it becomes available", yet as far as I can tell, there is no documentation anywhere on the site on where to get the notification.
My suggestion is rewording those sentences to read "If you are waiting for a specific deleted username to become available, you can register to receive a notification when the username is available for you to rename to by viewing the deleted user's profile page. You can view their profile page at http://exampleusername.livejournal.com/profile. (Replace exampleusername with the user name you want.)"
Alternately, something could be added to FAQ 25, like what I suggested above.
My suggestion is rewording those sentences to read "If you are waiting for a specific deleted username to become available, you can register to receive a notification when the username is available for you to rename to by viewing the deleted user's profile page. You can view their profile page at http://exampleusername.livejournal.com/profile. (Replace exampleusername with the user name you want.)"
Alternately, something could be added to FAQ 25, like what I suggested above.