Did you read the Arduino site at all? It mentions how the servos can be connected, how they may affect the PWM channels, how the power should be connected, etc. I mean, it is all right there. Not to mention your question started with "normal input" --I know this may have been just an oversight, or just typing fast but if you actually meant "input" it means you didn't google anything before asking the question. C'mon dude.
i was talking about picaxe and i accessed wrongly to site where they lie things
Page 19 to be specific. Using radio control servos.
Page 211, SERVO command. Page 213, SERVOPOS command. Good to know when to use which one.
theres 3 leads, one for +V, one for ground, and one signal.
the signal line goes to a digital i/o pin.