Enable k2 comments with recaptcha

I cant enable k2 comments with recaptcha on my site!
If i dont put recaptcha many spams post comments every minute!

Please help me!
www.aek1924.gr

Hi,
1) first you have to create a Recaptch account here: http://www.google.com/recaptcha/captcha
2) Go to your K2, than choose Parametrs icon , you will see K2 Parameters window.
Then choose Comments tabs, and Enable reCaptcha in comments [Yes], Save & Close
3) Go to : Plug-in Manager -> "Captcha - ReCaptcha" --> insert your keys.

Hi,
When i put the save and close, it doesnt close the window and remains a white window(!) When i close it (x) and go again inside it dont save the changes!

Can you check it?

That's strange, looks like error in CMS, have you update your Joomla to 2.5.9 ?
Then update K2 component also. If this don't work... write again, I will see you back-end.

Joomla and k2 are both up-to-date.
Do u want to see my back end?

any help here?