The solution packs are Pre Built PHP Applications that where created using the WebAssist Extensions.
They where created with specific functionality to perform specific tasks.
They can be modified using the extensions to add or remove functionality, but it is not the goal of the solution packs.
If you are going to modify the functionality of the solution pack, it is very important to be familiar with the extensions that where used to create the solution.
to become familiar with the different pieces of the registration and login process that is implemented in the User registration solution pack, you should become familiar with using Security assist and the security assist documentation: