Fresh noob looking to slightly edit an existing app

Hello, I'm entirely new to the bangle js 2, and I've almost never touched github and js before, though I did some coding ( mostly in java, php and C ). I want to take a pre-existing app, edit it a bit in pretty simple ways, and upload it on my bangle, but I'm really struggling with the tutorials for adding apps to github. What's the simplest way I could edit the app I'm looking for, ideally without using github too much ?

You can install the app from the app loader and then open the app file in the Web IDE to modify and load the changes to your watch. Just make sure you disable the preset regarding pretokenization under the 'More...' tab of the app loader.

Thanks, I'll try that ! What's pretokenization ? Why is it important ?

I'm not too knowledgeble of it, but it's one optimization technique for making apps faster. But it also makes it harder to read the code, so not ideal if you want to understand it and the changes you're doing.

good thx,
now i can experiement /w "swipe back to clock" and change from swipe Lt to Rt, into swipe Up to Down.

thank you both.

Great! Just to add:

pretokenization is effectively an Espruino-specific minification. It removes whitespace, and any 'tokens', like this, for, while/etc are converted to a single number. It's faster for Espruino to parse and takes up less space, but if you want to see the code you haven to get the IDE to convert it (and even then the formatting is gone so it's harder to understand)