Add data sources to the spacemap at right.
Then, explore your space. Hover over nodes to see their information. Drag to reposition. Highlight, remove, and add nodes below. Zoom in and out. Play with force settings to understand how they work.
Zoom in and out
Hold Option and hover over over nodes to see info; Option-click a node to pin its name (and keep it visible).
Click and drag to reposition nodes; hold Shift while releasing to stick them where they are.
Shift-click a site node to open its site in a new window.
Nodes are color-coded by type.