Note that the online-version does show off the editor, but you cannot (yet) upload or store anything. That requires extensive code on the topic of "what do I do if two people want to edit the same action?" which in turn will need user-authentication, which needs a way to create accounts and so on and so forth. Currently, everyone will just use the same account, and there is no code in place to support any editing at all.
Just click the link to open up the flash in a browser-window (requires Flash 10). I know there are still a few issues, some pictures don't load (or rather, empty pictures get displayed with a border, instead of not at all), but for the moment, this shall be enough. Styles are not yet supported.