Q: How can I see the most recent posts at the top?

A: The default order for the posts is "Show most recent posts at the bottom".
If you would like to have it differently you can change it in your personal settings.
To change just go to
[Profile] and there you have an option to change the message ordering
"Show most recent posts at the top"

This is an account related setting and therefore this can be of course be used by registered users. If you are guest then you will have the default sort.