Final answer:
The client needs further instruction on how to perform 'kick counts' during pregnancy.
Step-by-step explanation:
The statement by the client that indicates a need for further instruction is 'I need to lie flat on my back to perform the procedure.' Lying flat on the back during pregnancy can compress the vena cava, the major blood vessel that returns blood to the heart. This can decrease blood flow to the fetus and may lead to complications. The client should be advised to perform kick counts while lying on the side, either left or right, to ensure optimal blood flow to the fetus.