1) Go to YouTube.com and click "Sign In" (top right corner)
2) Click the box in the top right corner labeled "Create An Account"
3) Fill out the account creation form and click "Next Step"
4) You will be taken to your profile page where you may modify your profile. You may upload a photo to your profile or you can simply go on to the next step by clicking "Next Step"
5) You should now be on a welcome page. Simply click "Back to YouTube" to get started