Membership + New Blogs Templates registration/blog creation issue

Hello,

I am using membership plugin with New Blogs Templates. As far as I know there should be an option to create your own blog on the sign up/registration page. However, I cannot see it. There is only standard form with personal data.

Everything works fine: users can register and access their accounts (I am using buddypress), paid subscriptions are working as well.

I have tried to change network settings to enable logged in user to register sites. But then they can create multiple sites, while they should be able to create just one, and cannot choose the template for their blog.

All plugins are network activated and newest versions are installed (checked today)

thanks,