the authorisation takes some time because the authourities need to check up on the person who has regsitered as a precautionary measure. Since the ICIS link is on the website, and registering is quite simple, they have to be careful before activating a regsitration so as to avoid "phonies".
If someone who is already a member has recommended you, u willl be asked for details of that person so that he/she may confirm.
Wassalam.