Create Button Connect and Popup

I need a freelancer to create a login button when clicked on the screen is darkened a popup appears (this is already more or less made for animation) , it should get the display as this capture , it would change the screen if wishes were to create an account , respecting the present charter and specify , name, email , address, city , zip code , country, username and passwords 2 times a checkbox to accept the general terms the site, there's a link that is provided when clicked on the popup grows a bit and lets see site conditions with the ability to scroll this part must be well demarcated from the rest . To create an account fields must all be filled , if the form is not sent , check that the user does not exist via the MySQL user table , if there is to inform the user, then the form and send the user and add the popup back to its initial state to connect the login form check that the user and password are correct. Link forgot password shown when clicked on the popup changes and allows you to specify a username and a password , the form is send.