Customize the login page

hi, divya_djax ,

go to you site: https://www.******.com/studio/builder_page.php?type=system&page=sys_login 

Thank you for your reply.

How to connect the already existing login form with an API. Is there any documentation to work with APIs. Any help?

here is the wiki：

https://github.com/unaio/una/wiki/Dev-API