I have figured out which files to edit:
add the following line to the bottom: CORE_IMAGE_EXTRA_INSTALL += "<recipiename>"
eg( CORE_IMAGE_EXTRA_INSTALL += "iw")
Nagivate to and open the following file in a text editor: ~/work/ref-os-iot/meta-ref-os-iot/conf/distro/ref-os-iot.conf
Find the line that says "SUPPORTED_RECIPIES_CHECK = "warn" and uncomment it (ie, remove the #)
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