There are two answers to this question.
1) Manually route, and just do so one the desired side of the board. I usually manually route most if not all of the traces on my boards; I'm rarely if ever satisfied with what the auto-routers come up with.
2) Tell KiCad that your board is single layer only -- in PCBnew, click on Preferences, then on General. Click on the desired number of layers (1 in this case). Click okay, and you are good to go.
--- In Homebrew_PCBs@yahoogroups.com, "acidblue" <sunblaster5@...> wrote:
>
> How do I get Kicad to make traces just on one side of the PCB?
>