The statement that indicates the need for further teaching is "I can push the button whenever I feel pain." This is because the client should be instructed to push the button when they feel pain, but only up to a certain point. The client should not push the button too frequently or too many times, as this can cause an overdose of the medication. The other statements are accurate and indicate that the client has a good understanding of how to use the PCA pump, such as reminding family members to help push the button, informing the nurse if the medication is not effective, Is D using the PCA pump until oral pain medication can control the pain.