I'm practicing my wiki skills by editing some current articles...

Why can't I edit the top section of articles? Here's an example:

In it I can edit only stuff including and below the first header "Background".

How can the top part of articles be edited?

Thanks!

Resolved :)

I see that for the top section I need to use the Edit This Page tab at the top. Only the sections after the top have an "Edit" link off to the right.