all you need is a text editor —
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, for example — and some skills on finding and editing the desired text.
the document you should edit is
ch7_def.rpy, which can be found inside the folder
game/scripts/ch7/.
just make sure you make a copy of the
ch7_def.rpy document to your desktop, rename it (just add an "1" after the
_def) and
edit this copy, in order to not compromise the original document. after the editing, you can swap one for the other and delete the "1" from the document's name.
I haven't worked with Windows for a while (over a decade) so I'm not the best person to give you any specific details, but it's really not hard. also, as long as you keep the original document, you're safe.
I hope this helped.
cheers, CutieLvr.
edit:
I added a link to
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; it's quite informative and will help you to work with the app.