First Read the instructions in the project then go inside, after that open your backpack and drag the sprites in you backpack, Finally, Make a wonderful project using those sprites. Then Finally, And I mean Finally! Put you project in this studio :) = http://scratch.mit.edu/studios/502569/ Or just Remix it :T
Artwork by me Hope you make wonderful projects! (and if you dont get what i mean by backpack comment and i will help!) Thanks!!!!!!!!!