If you are logged into the game only through Facebook, the above link will not work. Please post back and I can give you different way to get your ID number!
** A Note: Please Edit above comment and remove your email address from it. Since it is the public forum, it is not advisable post your personal information. --> Click on the Cog wheel / Gear icon that is located in top right corner of your above post. You will see "Edit" option --> Click on it to open your comment box and remove your email address.
Thank you for posting in the Community! Have a nice day/evening!