There are two basic steps in the network highlighting - setting the highlight color and making selections. Use the Color Palette 
on the top left of the network viewer to set the color for the Next selection.
- Single node: set Scopes to “Single node” and then click on any node you want to highightl;
- Node-neighbours: set Scopes to “Node-neighbour” and click on the central node to highlight the node and its direct neighbours;
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A cluster of nodes: use the free-style manual select function - click the icon
, when mouse icon becomes cross hair, drag to select; - Multiple nodes scattered around the network: use Batch Selection on the bottom right panel- enter the list and click “Submit” to highlight.