Push-pull won't work

SketchUp
#1

I downloaded some free plans for a bunk bed which I’m modifying to my own liking. All was going well until I realized I can’t push-pull any faces. Nothing is locked, no groups… I don’t know what else would prevent this.

Plans attached.

Thanks in advance!

Bunk Bed (1).skp (242.5 KB)

#2

Everything in the model is made of Components, you need to open the component to edit it. Easiest way is to double click it.

#3

Excellent, thanks!