WordPress MU

Hi,

Very stuck on how to change the "about" page on all blogs on my network.

I edited it before I added the blogs via the site options page, the edited the first page on new blog with what I wanted on all the "about" pages.

But this is for all new blogs....

How do I change this now? as the blogs arent new anymore, and Ive tried it on the site options page, but it no longer works.

Help!!