Step 1: Log into your Drupal 7 admin dashboard.
Step 2: From the top menu bar, locate the People option and click it
Step 3: Next, click on the Permissions tab found in the upper right corner
Step 4: From here, locate the Comments section and find the setting labeled Skip Comment Approval. Uncheck the box for the roles you want to force approval on.
Step 5: Once completed, scroll down and select the Save Permissions button at the bottom of the page. Now, any users without the approval skip permission will see the message below after they place a comment.