The Consultant usually writes the PIN in the back of the black Food Optimising book in your new member pack. It will be on page 90 so quite near the back.
If the PIN isn't there then it could be written on your card. It is a 5 digit number.
If you can't see the PIN in either of these places, you can use the live chat option on the registration pages to speak to a member of the team who can check your card and PIN quickly for you
Alternatively, you can check your numbers with your Consultant when you are next in group.