Step 1 - Register for the Bug Hunt™ Competition
First, register for the Bug Hunt competition. This will give you access to the competition forum and JIRA project.
Step 2 - Review the Documentation
On the forum, there will be summary documentation of how to access the application, and how to report an issue. The issue report template is available here.
Step 3 - Go Compete!
Now all you have to do is find issues! Anything that violates the specified requirements, seems user unfriendly, or just needs improvement may count as an issue. Log anything you find using the template. If you have any questions, you can post to the forum or contact the competition manager.