I would like to have something similar than yours in order

Hi
I would like to have something similar than yours in order signing up my costumers in my site.

How did you do it?

I am working with appointments and of course exist the posibility to signing in through the wordpress login page or inside the plugin page itself.

But what about to signing up. I want the costumer to create his password and login like you do in your web.

Could you help me with that?
Thanks