Been doing HTML and CSS for a few years, however recently got into PHP for my job.

Taught myself the basics, but when it came to a login system I cheated and used Usercake.

All working fine, but I need to change some of the things on it, such as a popup for registration errors and things.

My question is, 

on the registration form of my usercake registration form, it already has labels setup which input to the sql etc, but if I wanted to use a script like the validation script, will they combine? Do I need to rewrite the php code so that the labels in the jquery are used instead? Can all three work together?

Also, do I just copy the call script function to the top of the page?

Sorry all very confusing for.. thanks for any help

p.s. Hello!