Tap on the Inspections tab at the bottom of the app and then tap on the Inspection you wish to delete. You will see the Summary screen for this inspection. If you tap on the Pencil in the top right of the screen, you will see a list of options, at the bottom of which is "Delete Inspection". Tap on this and the app will ask you to confirm your choice.
Please be aware that deleting an inspection is permanent - there is no way to recover it once it has been deleted.