Scroll: Click and hold down the left mouse button, press any key, and then drag the mouse to scroll.
Zoom: Rotate the mouse wheel (or two finger pinch motion on laptop trackpad).
Move single node: Click and hold on the node to select the node. Drag with the mouse to move the node.
Move multiple nodes: Hold the shift key while clicking the desired nodes to select, or click the background and drag to select nodes within an area of the network. Drag with the mouse to move the nodes.