For @ApolloTheWolf-318 only (although others can use the template, the coloured stickersheet is not free to use unless you are Apollo) Remove the watermarks if needed(also play around with it copy-pasting different stickers into different costumes to select only a few stickers or the stickers individually) and then right-click the image in the actual project screen not the backdrops. Select "save image as" and save it, then you can port it to Kleki (other art programs are available) to trace (the template) and save the stickers on your device.
Press any key to change backdrop I recommend using the template with the blue bits for beginners although change it to fit your fursona Also any art you do with this I would love to see although you don't have to :)