Editing database info from php?

Ok i know how to get the php to show the database info like in

But I’m making a page (w/out the tables) kinda like that to put members in a database and have the page display it. But my question is how do i make another page where admins can edit it. Like add/edit/delete members or the info that i have it query or whatever

http://www.texasmilitia.com/dod/?page=Home is the site.