Let's do this step by step.
1. Download and install
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When you install renpy, it creates a default folder where all the proyects will be saved, remember it, you'll need it.
2. Copy and paste the game you wanna play/edit/whatever into your default renpy projects folder.
3. Download
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4. Extract the rpy files from the game you wanna play/change/edit using UnRen.bat
5. Copy and paste the files you extracted using UnRen.bat into the game folder you created in step 2.
5. Open renpy, if you did everything now you'll see the game in your renpy thingy.
6. Select the game then click on gui.rpy ( You might need to install an editor, Editra is enuff )
View attachment 137444
7. Look for the code and edit it.
Enjoy
PD. If you don't understand anything, just ask again. Don't be ashamed, nobody's born knowing everything.