How to mark a single forum as read?

[p.dath]

I've found under quick links how to mark every forum as read. How do you mark a single forum as read?

[Virago]

Are you using the Light Universe or the Dark Zone? (Select at the bottom left of any page).

In the Light Universe, a "pin-board" icon appears to the left of each main forum, on the main forum page. If the icon is orange, that forum contains unread posts. Double-click the icon to mark that forum as read - the icon will change to blue.

The same applies to sub-forums listed under the main forum descriptions. If the little folder icon is orange, double-click it to mark that sub-forum only as read.

Don't think that this works in the Dark Zone though.