In late 2014, some KidWind Mini Wind Turbines were shipped with a yellow plug that was not pre-drilled. The yellow plug fits in the bottom of the metal support (the tower) and should have a hole to allow the wires from the generator to pass through.
You can make a hole in the plug yourself using a 5/32 drill bit, or you can forego using the plug entirely. If you choose not to use the plug, you will need to insert the metal tube into the base such that the flanged end is on the bottom.
If you are not comfortable with this, let us know. We will send a replacement.