Add New 4e Skill Challenge
From D&D Wiki
To make a new skill challenge, replace "MyChallenge" with the name of your challenge in the field below. Leave the "(4e Skill Challenge)" identifier. Then click the button and you'll be taken to an edit page with a template and instructions for adding your skill challenge. If there is already a page with the same name, you'll be taken to the Edit page.
For further information on creating skill challenges, see p. 224 of the Dungeon Master's Book, p. 72 of the Dungeon Master's Guide or Chapter 3 (p. 78) of Dungeon Master's Guide 2.