As jimbolito said - when you first sign up now, you have a few channels:

Spotlight Channel - the former Shows channel - a place to keep recorded posts.

Journal - a place to keep written posts.

WildClips - a special channel that shows all of your posts from any channel.  In the beginning, when you just have the two (Spotlight and Journal) this might be a bit silly, but as you add more Theme Channels and create posts in them, WildClips will give people a way to get a quick look at the latest that you've posted in any of your channels.  Hopefully we'll soon tailor the WildClips page for mass-browsing of posts - probably switch to a thumbnail view.

To edit a post that you've created in any channel, use the menu on the icon to the left of the post's title.  I know we need to make that much more obvious - it's hidden compared to the old Edit Post menu.