You just need a simple text editor
if you have figured out howto install this package, you have been able to create a "MiniPad" directory on the Iliads filesystem. Within this directory you will find a subdirectory "_files" and within the latter the file "App.lua", where the changes have to be made.
Copy the file "App.lua" from the Iliad to your PC/Laptop (or if you have installed the programm on an MMC-Card just insert that card into your card slot of the PC/Laptop). Edit it on the PC/Laptop
(using Linux use an editor like vi, emacs, nano, ...; using Windows use an editor like Notepad, Writepad, ...). Afterwards copy the file back to the Iliad. There should be no need for a developer package.