I created some "about" pages on the blog and checked "allow comments" for them, but it is not possible to comment on those pages. Is there something missing in the template I'm using or am I supposed to do something else to make comments work on "pages"? Thanks!
If it's a well-developed theme you can choose Page Template -> with comment (something like that). Or create another copy of page.php and add <?php comments_template(); ?> before end loop.