Add to php web site

Hi everybody i want to add some fields in a form that already is working on my site. i just want to make that form like a user register because now its working just like a fill information and upload a picture you can try it and them see how it work go to www.turemember.com. i want every user that fill that form stay already register in my website and them have acess to the control panel for edit or delete that information.