Custom Static Page

Hi Guido,
Thanks for your nice theme, I installed myknowledgebase.
I am new in wordpress, I dont know how to custom static page like this
http://www.guidovanderleest.nl/myknowledgebase-theme/knowledgebase-fullwidth/

is there any page template or plugin to create it?