Add photos to at least 2 classes, 2 or more photos each. Your own photos work best.
Drag blocks to move them. Drag from a dot to another block to connect them, or drop on empty space to add a block. Right-click a block or connection for more. Select one and press Delete to remove it.
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.