User WikiSkin#For a user to change their own personal WikiSkin, go to My Prefs link, and edit their own user settings.
Default WikiSkin#To change the default WikiSkin, update (or create) the <tomcat>/WEB-INF/classes/jspwiki-custom.properties (see Configuration for more info).
Place the following into this file.
For different skin options see WikiSkin
Restarting the tomcat server to see the theme in action
If after restarting your theme does not change, clear your browsers cookies, as the user preferences are saved in Session cookies.