I used Osol Captcha and it doesn't work. It should be at least here - bham24.pl/component/users/?view=registration

And how can I use captcha in register form in the popup?

I tried to register after turning the captcha on and it turned out that the captcha works, but it isn't visible. When I try to register using popup, I've got a message that I haven't filled the captcha. But I can't see the captcha.

I turned on ReCaptcha and it is visible in the default registration form, but not in the popup. Tomorrow I'll see if spam users register. Today had at least three spam users registered.

ReCaptcha effectively blocks spambots, but there is another problem. It is invisible in popup registration but when a user try to register there is a message that recaptcha cannot be empty.

Dear Katarzyna Meszka,

We're sorry, if you want us to change it for you, please take into consideration to post your requirements to custom work ticket.

Thanks!

Never mind.