Devise password after confirmation

Hi, I am fairly new to rails and i'm trying to figure out how to get a user signed up first and later after they go to account confirmation link mailed to them ask for password.
I read about it on https://github.com/heartcombo/devise/wiki/How-To:-Override-confirmations-so-users-can-pick-their-own-passwords-as-part-of-confirmation-activation

Can anyone help?
My code is hosted on https://github.com/brijesh-wawdhane/stride/tree/team