Nodes are the junctions at which polylines join each other, this ensures the network is topologically correct. Each polyline has two nodes a from-node (the point at which a line starts) and a to-node (the point at which a line ends). For RivEX to process the river network for stream orders, the network must have correct node information stored within the attribute table of your polyline dataset.
More advice about creating nodes is given in the manual.

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Create new node ID fields for the river network

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Create a layer of all network nodes

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Create a layer of only mouth nodes

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Create a layer of only source nodes

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Create a layer of only pseudo nodes

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Create a pseudo node free network

Example of source nodes extracted from network using RivEX

Sources extracted from a network

Generating nodes from your river network