Help with a few modifications to the Blog in 15 Minutes screencast

Hi, I'm fairly new to rails, and I recently followed the screencast on
the rails site to make a blog. Everything is working quite well, and
I'm understanding the majority of it, but there's two things I want to
do, that I'm not sure how to approach.

1) My blog posts display in ascending order. They need to be
descending order. So the first post I made needs to be at the bottom
of the page not the top.

2) How to modify the posts to have "posted at: Day mm/dd/year
00:00:00" right below the title of the post. And I don't mean I want
to type it in everytime. I would like it to detect the time that I
submit the post.

Thank you in advance!

Disregard this message I figured everything out myself