Registration from is blogs-MU or BP?

Hi

I have blogs-MU with BP.
Registration from is blogs-MU or BP?
I just add Captcha plugins from BWS Plugins. I enable captcha for registration form, but when I check registration still didn't see the captcha but I can see in the login from.

Enable captcha for BP available in the Pro version.

For blogs-MU with BP.
Registration from is blogs-MU or BP?

Thanks!