To scale or rotate content within a design, you may utilize the respective functions within the Objects panel of the design work space, as pictured below:
Scaling and rotation are performed by first selecting your design element(s) you wish to manipulate. You may then drag the slider for either scaling or rotating and drag either direction until you achieve your desired outcome.
Image size can also be adjusted by grabbing the corner anchors of your design and pulling in or out. To rotate, you can click and hold down the rotate symbol above the element and turn it with the mouse.