You can edit your registration before the day of the photo shoot via the link in the sign up confirmation email. Check the box for a friend photo, write down the name of the friend, and save the changes. Please make sure you have the consent of the friend's parent. It is a good idea to write down your request about friend and sibling photos on the paper form as well, if possible. There is no need to give a separate permission to take photos of friends and siblings, as the general permission is usually given when signing up.