Unzip and navigate to your FBW A320 folder inside the community folder. Find SimObjects/ Airplanes/ FlyByWire_A320_NEO/ TEXTURE. Move the existing CUP_LOW2_ALBEDO.PNG to another folder (as a backup) and replace with the new unzipped file.
Also go checkout my discord to stay up to date with the Different FBW A32NX Cups that I am making and I am also offering to the first 2 people get early access to mods! see you there!
https://discord.gg/5t7qRG95