Post the code you're using here rather than hoping we'll wander all over the internet trying to find it.
But one problem is not enough power for the servos. You need a SEPARATE 5/6V supply of at least 3A to run 3 standard size servos safely. Trying to run any type of motor/servo from the Arduino 5V pin is a bad idea though you sometimes get away with a single micro servo for a quick test.
Steve