Download Red Reaction.7z.

Open/Extract the .7z archive. You can use 7-Zip to do this.

Create a Skins folder in the root of your flashcart’s SD card.

Inside the 7z archive, you will find a folder called Red Reaction.

From this folder, copy Red Reaction.skn to the Skins folder on your SD.

Place the SD card back into your cart, and launch Moonshell 2.

In Moonshell 2, navigate to the Skins folder and press A on Red Reaction.skn to apply the theme.