When viewing the project page (in regular or full-screen mode), click and drag your mouse to draw on the stage with stamped versions of the sprite. Press the space key to erase all. Press the right arrow to change costumes. Remix and add different costumes, change the effects, or adjust how the drawing is controlled.
Find our tutorials on Conditional Statements and "Unlock the Block: Stamp Block" on the official Scratch YouTube channel (ScratchTeam) for more information. Or check out the project "Create an Image with Stamps" to try another way to make art with stamps https://scratch.mit.edu/projects/819395727