Next time post on Help section:
Well, I only used a cracker one time, because I was curious.
It works this way:
You put a big list of usernames(you can load from a .txt file) and 5 passwords(I think it's the max number os attempts before AE locking the account)
The cracker will thy to log in on each account with those 5 passwords. If you succed, you will recieve a message.