How exactly can I create a page "Users" like in your demo? Including ascending/descending in the header, etc?
The users page is fully automatic and you can simply access it with the following urls
1. If permalink structure is active then http://EXAMPLE.COM/users
2. If not active then http://EXAMPLE.COM/?exc_custom_page=users
how can we add a search to the users page?
You have to modify the theme files in order to achieve this functionality.