Thanks for your answer surfy :) 
  
My GSP uploaded bf3_pbbans.dat to my punkbuster root folder, i tried to load it with "pb_sv_banload <filename>" command but i get the answer "0 bans loaded from bf3_pbbans.dat". 
  
I don't know if it's punkbuster not working properly or my GSP that failed to upload the file correctly. 
  
Anyway, i followed your advise and took the time to create a new clan forum, make some friends come inside and register on it so i can apply properly.