How to print login and signup details in a site using Admin button

I created a login form using html and css, i had created a Admin button when i click on the admin button it needs to print the logged in and signup persons details in a table format.

Iam learning java script, html and css. So i created a simple login form and then i created a admin buton.I decided to give a functionality to admin buton.

1. When i logged in or signup i need to store that data
   2)I need to print the stored data when i clicked on admin button in tabular format.