Kicad: creating PCB traces (basic question)

In the Kicad PCB layout package (pcbnew) how do I draw a track
between two component pins?
What I mean is: suppose I place two component footprints (say 2 x 16-pin
DIL's)
on the ***, select the copper layer, and try to draw a trace between
one pin on one component and another pin on the second component.
When I then try to draw a trace between them, I can't, because clicking
on the start pin commences the trace OK, but clicking on an endpoint pin
doesn't seem to work.
I didn't draw a schematic - I just want to do a small layout.

This is kinda basic, and I'm wondering why it doesn't work.

Thanks,
J.
.