How to participate will be explained using screencast challenges. To dive right in, go to Screencast Challenge Checklist and start from the top. Click the links and follow the instructions. The following is a summary of how to participate that was written before deciding to try and accomplish everything through screencast challenges.
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Record yourself performing a set of actions in your wiki that you want to challenge others to carry out. Consider adding your tool of choice to Screencasting Tools
Upload your recording somewhere so that it can be embedded in the wiki page you create to make your screencast challenge. Share your Video Hosting Services with others.
Create a wiki page that explains to others how to attempt to complete the challenge. Embed a screencast on the page showing yourself completing the challenge.
Add your challenge to the Screencast Challenge Checklist so that others can discover your new challenge and consider attempting it.
Add your site to the Screencast Challenge Roster, so that others can know that your are participating and follow along with your progress.