How to make mods.
Anything in the Modifications folder will end up in ROBLOX's Resources folder.
To open the Modifications folder, Go to the Mods section and choose option 1.
Heres an example! Replacing the death sound.
The death sound is located in Resources/content/sounds/ouch.ogg
I would need to put my custom death sound in Modifications/content/sounds/ouch.ogg
After this I can apply mods and the death sound will be replaced!