can't detect the problem. is it impossible??

installed buddypress ajax chat on my site.(im using wordpress 3.0.1 and bddyprss 1.2.5 with default theme)
i uploaded plugin without any editing and activated and it is showing fine but i cant send txt by clicking sumbit or pushing enter.
i mean it doesnt show my text msg in the box after submiting.
<see the condition on my site>
cant detect the problem.i found its need to b edited with mysql
user.pass etc in config.php but its hard for me to do these changes as a basic user.
——————————————————–
i visited couple of sites & cheked the plugin forum but didnt meet any similar problem
———————————————————
(Note:using 000webhost.com freeplan)