How do I apply polygon collision on auto-runner?

The template does not allow me to apply collision polygons to the platform, how can I make it so that it does?

Open up the image editor for the object, click the polygon editor on the left sidebar (bottom one) and change the collision polygon.

The icon is grayed out, its confusing.

mediafire.com/download/k37wwdez6h5fpm5/Autorunner_v2.capx

here is the revised version I am using if you would like to check it out.

Its got to be some silly setting.

You can't use a collision polygon for tiled backgrounds. Make them sprites instead.