How do I control objects?
When you select an object, a bounding box will appear around the the object. These are the blue lines + the little boxes on the corners.
By selecting on the boxes in the corners and dragging it you can change the size of the object.
By selecting a side and dragging it, you can expand the object in that direction.
When you drag and hold "Shift" the resize will stay in the same proportions.
And when you hold "alt" while dragging the other side will be adjusted in the same way.