function ChangePassword(username, password, newpassword) {
        var authenticationDetails = new AmazonCognitoIdentity.AuthenticationDetails({
            Username: username,
            Password: password,
        });

        var userData = {
            Username: username,
            Pool: userPool
        };
        var cognitoUser = new AmazonCognitoIdentity.CognitoUser(userData);

        cognitoUser.authenticateUser(authenticationDetails, {
            onSuccess: function (result) {
                cognitoUser.changePassword(password, newpassword, (err, result) => {
                    if (err) {
                        console.log(err);
                    } else {
                        console.log("Successfully changed password of the user.");
                        console.log(result);
                    }
                });
            },
            onFailure: function (err) {
                console.log(err);
            },
        });
}