Problem implementing creating trigger using MYSQL 5.0

[suchi madala]

Can anyone help with this. I am struggling to know wants wrong with it. I think i might made a mistake since i dunno the way to use the delimiters.
Here I want to set the date each time insert is performed on my orders table using the following triggers using MYSQL 5.0. Please help me to solve this

CREATE TRIGGER orders_update ON Orders
FOR INSERT AS
BEGIN
UPDATE Orders SET order_date = GetDate() WHERE ordernum = (SELECT ordernum FROM inserted);
END;