I've tried to add a third column to Twenty Ten as this guy recommends by modifying the CSS code. http://zeaks.org/twenty-ten/twenty-ten-child-theme-how-to/ The column is showing up, and it's listed in the widget area as a secondary widget area, but when I drag widgets into it, they don't show up on the blog. There's just a big white space there. I've been searching the forums for advice, but all I've found is something about "registering" the sidebar, which appears to have something to do with changing the php. The supposed instructions for doing this don't really explain anything, and besides, I saw a notice that says you can't change the html or php for a template.
Another problem I have is that all the blog posts I've ever done seem to be showing up on the front page, and I can't reset this in the "reading" section of settings.
The blog I need help with is lisanowak.wordpress.com.