kathrynwp on "How do i change 'pervious post' and 'next post' at the bottom of my post"

That tweak is possible with self-hosted WordPress.org sites, but not here on WordPress.com. You can learn more about the difference between self-hosted WordPress and WordPress.com here:

http://en.support.wordpress.com/com-vs-org/

If you've seen a WordPress.com site that's done it, would you mind adding a link here so I can take a look? Thanks.