Press Green Flag, Click on Start, Press Right arrow key to go in front, Left arrow key to go back, Up arrow key to go up and Down arrow key to go down. Click on right arrow for next backdrop and left arrow for previous backdrop (Showing On Screen).
I want to thank Scratch Team. Here is there channel link https://www.youtube.com/c/ScratchTeam/featured copy this and enter is address bar or search on Youtube Scratch Team