i just got a fuataba 72 mhz 4 channel tx and 6 channel rx  ,when i m connecting the esc to tx ,it is not working  and makes beep sounds ,and sound goes on.
i have several questions 
1)there are two ways to put signal wire of esc into the rx ,which one is right.(or can i put in any way)
2)receiver needs charging or not(as i have got 2 pins in my futaba charger).
3)futaba charger stats ,120 volt ac ,but in our home it is 220 v ac .
4)when i switch on my transmitter only red light goes on not the green one.

i m using futaba r136(6ch) reciever and emax 18 amps esc .

ESC Beeping could  mean throttle channel need to be reversed

1) There is only 1 way to connect to receiver  ensure polarity before connection
2) receiver does not need charging   the power to the receiver is from the ESC
3) get your self a 220 V  charger banging your head any  number of time with a 120 v adapter is no use
4) your tx batteries need to be charged .

Sai

you need a BEC (BATTERY ELIMINATOR CIRCUIT) and not a ESC (ELECTRONIC SPEED CONTROLLER) to power you reciever. Some ESCs ave a built in BEC. From your questons, i sugggest you show your RC set up to someone in the hobby or we will soon be reading queries about burnt out TX Rx.etc.
the ESC is connected to the RX on channel 3 and not to the TX.
Avijit

Trying to clarify the above responses once more.

1.  Many receivers have a thin extra slot on one side of the connector pins (to accommodate Futaba style connectors, as seen at the bottom part of the image in this post http://www.rcindia.org/electric-power/help-dead-power-set-up-on-mr-moss/msg10891/#msg10891). If you locate that extra slot, that is where the "light" colored wire should plug into (among the 3 wires, one is usually white or yellow).

2.  The receiver itself has no battery inside, so there is no question of charging it. The power it needs is supplied either directly via a 4.8-6v battery, or from a BEC. Most ESCs come with built in BECs these days, so 99% of the time, you will just power the receiver using the power+signal 3-wire lead coming from the ESC.

3.  That is because the charger was built for US standard voltage (110v). You can get a converter that changes the line voltage from 220v to 110v in any electronics shop. So you plug that into the wall socket, and then plug your charger into this converter. All it has is a transformer, so it will be bulky.

4.  What is the model number of your transmitter ?