This style only works with Weasyl 2.0 forum theme. You can change your forum theme in Settings > General Settings > Miscellaneous Options ( it's at the bottom ) > Forum Skin. Choose Weasyl 2.0 in the pull down menu, then Save Changes.

Version 1: Only the most basic areas ( the posts and threads ) have been edited, other areas like settings and the twitter widget aren't styled yet ( but will be ). There's likely a few areas I missed but I will get to them too, no worries.

Version 2: Edits to some post buttons, the quick reply field, various thread options, and parts of the advanced reply settings.

Version 2.1 That pesky edit post button.