You can access your Lab or Challenge Management Dashboard by hovering over My Labs or My Challenges at the top of your page. From there you can click either Create to take you directly to the Lab or Challenge creation page, or you can click Manage to go to your Challenge or Lab Manager page.
From your Challenge Manager Page, you can view, edit, add, and delete Challenges.
From your Lab Manager Page, you can view, edit, add, and delete Labs.
For more info on challenges, see: What is a Challenge?
For more info on labs, see: What is a Lab?