1. On the upper right hand side of the main page and click “Create Account”
  2. Above the boxes select “Create One” which will bring you to the account creation page
  3. Enter the captcha¬†(Wikipedia uses this code to prevent computer activated programs from creating accounts. If the code expires you can always click “Refresh”) and hit “Create your account”
  4. Create your username
  5. Create your password
  6. Re-Type your password
  7. Insert your email address which is an optional step
  8. Select “Create Account”
  9. Registration is now complete

Source: Wikipedia