Chat login with Fb & Twitter not working. How to set?

i've bought the CHAT plugin
installed and working on http://www.leragionidelcuore.it

By Firefox i see only twitter login (not Fb)

By Chrome i see both way to login, but they don't work...

How can i set them?

please let me know asap

(can you write in cc to danieledezi@gmail.com / our webmaster)

Thanks in advance.

D