Right-click and select Clear Selections.
Select an edge.
Click Propagate
to list all the edges in the loop.
To automatically select a different chain of edges:
Right-click and select Clear Selections.
Select an edge.
Click Propagate
to list all the edges in the loop.
To manually select each edge:
Right-click and select Clear Selections.
Select an edge.
In the graphics area a red arrow appears at the endpoint of the
edge and indicates a possible next edge, and selection tools appear in
the PropertyManager.
In the PropertyManager, click the selection tools as needed until the chain of edges is complete:
Add
selected edge 
. Adds the edge indicated by the red
arrow to Edges.
You can press Y
instead of Add selected edge .
Select
next edge 
. Changes the red arrow to indicate a
different possible next edge.
You can press N
instead of Select next edge .
Zoom
to the selected edge 
. Zooms to the edge selection
area.