Hi,
The "blog" supports "wiki".
You can edit certain pages, like this one:
http://www.cocos2d-iphone.com/documentation/tips-and-tricks
With your forum user, you can edit the page.
Cookies between the forum / blog are not working yet, but I'm working on that.
So probably you will need to login again in the blog with the same user/passwd as your forum user/passwd