Welcome to the One Laptop per Child wiki. Please make yourself at home; read through the Table of Contents and FAQ, and take a look around. If you need a general wiki-tutorial, Wikieducator has some excellent ones.
Some possible pages of interest:
Check your preferences and be sure you verify your email address and turn on email notification if you'd like it -- you can find out when your talk page, or any page on your watchlist, is modified. You may want to upload a photo or information about yourself to your userpage (examples: 1, 2).
You can edit a page at any time by clicking the "edit" tab at the top - and since this is a wiki, you can edit anything, and don't need to ask anybody for permission. Feel free to leave me a note on my talk page if you have further questions or need help finding your way around.