Once finished, move your entire folder into the .minecraft/resourcepacks directory. You can find this by going to in the Minecraft main menu.
To ensure the pack works properly, your main folder (named "SPREENDMC RAINBOW 32x") must have this exact layout: (Folder) assets (Folder containing the textures) pack.mcmeta (The file you just created)
Open a plain text editor like (Windows) or TextEdit (Mac). Paste the following code into the editor:
8.9 or 1.21) so I can give you the exact pack_format number?