How can I do a Matlab report?

We have to submit a Matlab (my worst module) assignment to show the heat transfer on a plate. However, I have the 2 codes almost done but I am struggling to write the report. To calculate the temperature on a 2D aluminum plate we need to use the Explicit Finite Difference Method. The problem comes now when I read the task description, which is the following one:

*Table of contents

*Introduction to the problem under consideration

*The constitutive equation of the problem

*Description of the numerical method chosen to discretize the constitutive equation

*The initial and boundary conditions implemented

*Details of your Finite Difference Method

*Analysis of the code....... (I understand everything else from here)

This is what I don't understand and what I don't know if I have done properly:

**The constitutive equation of the problem (On here I explained TAYLOR SERIES and the HEAT TRANSFER)

**Description of the numerical method chosen to discretize the constitutive equation (On here I have explained the Explicit Finite Difference Method and numerical differentiation)

***Details of your Finite Difference Method (I don't even know what I have to do on here)

[Steven Lord]

This doesn't strike me as a question about MATLAB, instead this seems like something you should ask your professor or the person to whom you're going to submit the report to clarify.