The control buttons on the right work as follows:
- top left up and down arrows: scroll through the list of shapes for the element to add
- top right up and down arrows: change hue of the color of the element to add
- top right left and right arrows: alter brightness of the color of the element to add
- left and right arrows next to the "A": change orientation of the element to add
- up and down arrows next to location description: change target location and size of the element to add
- center left undo-icon / hook / angular arrow: remove the last element added
- center right "x"-icon: delete creation
- bottom left "+"-icon: add element with the selected properties
- central bottom save / floppy disk icon: show / hide a list with an entry containing a code you can copy and save on your device, to later restore your creation
- bottom right rectangle and up arrow icon: allows you to enter a saved code to restore the saved creation
Attention: Saving and loading creations may be currently broken. Don't expect these features to work properly.
If you want to keep your creations, take a screenshot of them.