John Montroll Stink Bug help

[subhmohanty]

Hi,
I am trying to fold the stink bug from John Montroll's book "Origami for the enthusiast". However am stuck on step 18, where it says pull out inside layers, cant seem to understand how and which layer is he talking about. Any help will be appreciated.

Thanks!
Subhendu

[subhmohanty]

Sorry have been really dumb found out how to do it !