I am trying to implement the popup registration/login form

I am trying to implement the popup registration/login form via the top nav item "register/login".

The form I am trying to use is the one that pops up when clicking "sign up" button on page http://developinghealthyhabits.com/registerlog-in/

see how the right side has a register form, and the left has a login form? How do I incorporate that in a different part of the site? Thanks!