Club Roblox offers the feature to include decals that are uploaded to Roblox. On your PC, you can click the Create tab on the Roblox website. On the My Creations tab, on Decals, you can upload your own decals for approval via Roblox's moderation. On the Library tab, on Decals, you can search previously approved decals. For either option, click the individual decal to be brought to its page with its own link. In this link, there is a series of numbers, which is the decal code.