How do i add registration form?

Hi, my website is about to be done, things works great!
I have just one problem for now, and it is that when a customer goes to the accout page he has only login form and does not have a registration form.
How do i fix that? how can i add registration form?

This is the website which im working on: http://inonc6.sg-host.com/

This is the problematic page:
http://inonc6.sg-host.com/my-account/?action=login

Thank you very much.