I checked out this article [Creating a simple module/Developing a Basic Module](http://docs.joomla.org/J3.1%3aCreating_a_simple_module/Developing_a_Basic_Module) for building a basic Joomla module. I understood the MVC architecture and file structure they've mentioned there. It is a simple Hello World module for Joomla. 

Now I want to modify this module in a way that it accepts whatever text I enter (instead of static "Hello World") from Joomla back-end. What I don't get is, **how to** or **where to** enter the code for the text-box field that gets displayed in Joomla back-end of this module?

In short, the link above doesn't mention anything about entering back-end parameters for a module. How to do that?