why cant i activate my blackberry enterprise server connection?

[Myra]

I REALLY NEED HELP...I PURCHASED A PHONE ON EBAY, AND I CANT SEND PICTURE MESSAGES IS ALWAYS ASKING ME TO SEPUP MY EMAIL I TRY BUT I JUST DONT KNOW HOW......EVERYTIME I TRY IN SEND A PICTURE IT SAYS I NEED TO THE ENTERPRISE ACTIVATION PASSWORD ...I SEND IT WITH A TECH THEY COULDNT DO ANYTHIN THEY JUST SAID I NEED TO COMMUNICATE WITH THE PERSON I BOUGHT IT FROM.....BUT THEY ALSO DONT HAVE A PASSWORD ...IS THERE ANYTHING I CAN DO .........CAN SUMONE HELP ME PLEASE THANK U!!! I WOULD APPRECIATE IT