Activation of user id

one of my friends pan has been registered at income tax efiling portal by some persone, but he had not activated the user id after registration by clicking the activation link sent by the departement.

now how do i activate his account scine we dont know the password ..

also i had sent mail at validate, but they ask or the pan address, which was provided but the response mail from departement has rejected the address provided by us.

please help me to know  the pan address and the proceedure to re activation of user id..

i have tried the option available at efiling portal regarding re activation link but it requires password which not known to us.