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//Part that sets up password in new.php
            $sql = "TRUNCATE TABLE tennisCoaches";
            $conn -> query($sql);

            if($password !== ""){
                $temp = md5($password);
                $sql = "INSERT INTO `tennisCoaches`(`password`) VALUES ( '$temp');";
                $conn -> query($sql);
            }

            $conn -> close();


//coach.php stuff
// And by that i mean everything up until i encapsulate the form/tables in an else{}...

<!DOCTYPE html>
<html lang="en">

<?php
session_start();
$_SESSION["password"] = isset($_SESSION["password"]) ? $_SESSION["password"] : "";
?>

<head>
    <meta charset="UTF-8">
    <title>Match Counter!</title>

</head>
<body>
<div id="wins">
    <?php
    $servername = "devweb2017.cis.strath.ac.uk";
    $username = "ywb16155";
    $password = "xAtYbFaLTKjTGPtj";
    $database = "ywb16155";
    $conn = new mysqli($servername, $username, $password, $database);

    if (isset($_POST["password"])) {
        $_SESSION["password"] = $_POST["password"];
    }

    if ($conn -> connect_error){
        die ("connection failed ". mysqli_connect_error()); //remove once debugged
    }


    $sql = "SELECT * FROM `tennisCoaches`";
    $result = $conn->query($sql);

    $serverPass = $_POST["password"];
    if ($result->num_rows > 0) {
        while ($row = $result->fetch_assoc()) {
            $serverPass = $row["password"];
        }
    }

    if (md5($_SESSION["password"]) != $serverPass) {
        ?>
        <div>
            <h4>Please login if you are a coach.</h4>
            <form action="coach.php" method="POST">
                <p>
                    Password: <input type="text" name="password" value=""/>
                </p>
                <p>
                    <input type="submit" value="login"/>
                </p>
            </form>
        </div>
        <?php
    }else{