Homebrew Channel only gives me...

four blocks (when I press home), none of which do anything (credits, return to bubble, reload, exit). Other than that, all I get are bubbles. I'm tired of popping them, how do I use this program please.

The homebrew Channel is a loader - a starter.
Place the homebrew you wanna run on a SD-Card.

to be specific, place homebrew in an "apps" folder on your SD card (at the root), and put each homebrew in it's own folder within "apps". Inside each homebrew's folder there should be a boot.dol, an icon.png and a meta.xml (think those file names are right). Then when you load HBC, each app will show up.