I am just wondering where my mistake was , and if it is a simple fix or if it will be a bit harder to fix. You guys don't have to write the answers for me, just point me in the right direction and I think I should be fine, because I've been looking at this for half an hour now , and I can't seem to figure out where my mistake was.. Inserting comments is working wonderfully, I'm just having issues with getting them, and posting them on my page(?)
  // INSERTING COMMENTS INTO THE DATABASE
    <?php
    function setComments($conn) {
            if (isset($_POST['commentSubmit'])) {
              $author = $_POST['cauthor'];
              $date = $_POST['date'];
              $message = $_POST['message'];
              $sql = "INSERT INTO comments (c_author, c_date, c_message)
                      VALUES ('$author', '$date', '$message')";
                  $result = mysqli_query($conn, $sql);
            }
    } ?>
       // GETTING COMMENTS FROM THE DATABSE
    <?php
        function getComments($conn) {
                $sql = "SELECT * FROM comments";
                $result = mysqli_query($conn, $sql);
                $row = $result->fetch_assoc();
                echo "$row['c_message']";
        }
    ?>
