Final answer:
To properly perform abdominal thrusts, the CNA should place their first above the navel and below the xiphoid process, and then use a quick inward and upward thrust.
Step-by-step explanation:
When performing abdominal thrusts, a technique used in first aid to dislodge an obstruction from an individual's airway, the Certified Nursing Assistant (CNA) should place their fist slightly above the person's navel and well below the xiphoid process. This is typically at the midpoint between the navel and the rib cage. The CNA's other hand should grasp this fist and both hands should then be used to push inward and upward with a quick thrust. It is important not to apply pressure directly to the xiphoid process or the lower rib cage to avoid injury to these areas.