HOLD ON A MINUTE!!!

Don't do anything until you are sure you have that plane secured. If the throttle IS reversed, you are in for a very interesting surprise when it goes full throttle on you without you being prepared for it.

Electrics are very different from glow or gas. With a glow or gas, if you get something in the way of your prop, it will do some damage then stop. Damage to, say your fingers, arm, leg, and so on.

With electric, however, if it goes full throttle, and hits something, because of the nature of the electric motors, it will try to continue turning, and cutting, and maiming. Be very careful when playing with electric motors on planes with those sharp, rotating blades. Yeah, I know this from personal experience - five stiches on my right index finger.

My suggestion is this:

Remove the ESC from the receiver. Connect all of your other servos to THEIR PROPER SLOTS based on the radio you are using (as Ken pointed out, not all radios have the throttle on channel 3). Make sure the aileron goes to the aileron channel, the rudder goes to the rudder channel, and elevator goes to the elevator channel.

If you don't know what channel is what on the receiver, well, that's simple to figure out.

As I said REMOVE THE ESC from the receiver and just let it hang there for a while. While you are at it, remove the prop from the motor, for safety, in case you do not remove the ESC from the RX.

Power up the receiver with a separate battery. That will insure that your ESC is safe and disarmed (with it disconnected). Then plug in your elevator wire to what you think is the elevator channel on the RX. Turn on the TX and wiggle the elevator stick. If the elevator moves as predicted, then you are ok. If not, then shift the elevator servo wire to a different RX channel and try it again. Do this until you have the right channel for your RX and the elevator channel.

Repeat for the ailerons and the rudder. Once you are satisfied that you found all the correct channels for your control surfaces, THEN REMOVE/DISCONNECT THE BATTERY and connect the ESC to the one remaining channel (1 to 4 are the basic four.. aileron, elevator, rudder, and throttle). Other slots are for auxiliary channels and functions (flaps, gear, and so on).

Move the throttle trim to minimum and the throttle to minimum. Power up the ESC by plugging in the flight battery pack. the one you are going to fly this plane with.

If you have not done so already, REMOVE THE PROP. Slowly move the throttle to full. It should beep. Slowly pull it back to idle. It should beep again.. maybe two or three times. The next movement of the throttle should start the motor turning.

There are two things to consider here. First, IF the throttle is at minimum but the ESC wants to turn the motor at full throttle, AND if you go to full throttle on the transmitter, then reverse the channel in the transmitter. If the ESC throttle is ok, meaning it is at minimun with the TX stick at minimum, and goes to full when you throttle up to full on the TX, then you are good to go.

Next, if you motor turns backwards, but all else is ok (meaning when going to full on the TX and the motor turns backwards), then reverse any two of the three wires between the ESC and the motor (brushless). If brushed, simply reverse the two wires going from the ESC to the motor.

NOW you can mount the prop if you so desire.

I hope this helps. JUST BE CAREFUL with that electric motor with the prop bolted on.

CGr.