up and down arrow to cycle through costumes 1=place objects 2=turn objects (click an object, then click when you are done pointing) 3=move objects 4=delete objects 5=draw with pen e=erase all c=clear all objects
Go to the sprite and import any costumes (e.g. text) that you want to use, and delete the example costumes. Make your thumbnail, then go back into the editor move a block. Now press the save project button to save your thumbnail
