First, the organizers want you to vote on two of the featured games. Developer voting for eight of the Uprising slots is going on now; those games will be released at the rate of one per day from August 22 - 31 . On August 1-15, community voting will open up for two additional titles. These two games will then be released at the end of the Uprising, on September 1 and 2. You can follow the promotion on the new Uprising site.
The second way you can help: buy some games when they come out. Obvious, really.