You can use the scripts if you click on them on the left side of you screen. On this list you can see what key opens/closes the pink blocks: A=a/b F=f/t To put the pink blocks in you programm just cklick on then. If you cklick on the green dot on the right side, a menu will open where you can reset sprite or reset script if you are finish in that menu just click on any part of the green surface. To start your script just click on the very first icon of the code.
If you find a bug please tell me in the comments.