For paid host, please set the Chat Client Location like this, for example: http://host71200.123flashchat.com/phpchat/ ,
Buy host here;
For trial host, please setup Chat Client Location like this: http://trial.123flashchat.com/yourhostname/ , Just replace "yourhostname" to the real one when you applied,
Apply trial host.
If you fill in it with a wrong format, you are not able to do the next operation.