How do you setup the Optic 6 for a plane that has dual elevator servos?

Refer to the Optic 6 Tutorial or Page 39 of your manual - both usually available under Manuals and Tutorials on the Hitec web page www.hitecrcd.com whioch is presently down for apparent major rebuild.
Your topic is well covered page 39 & 40 of the Optic 6 Manual.

AILV - Ailevator Function

Setting Up the Ailevator Function
1. This function requires two elevator servos, one for each side.
Plug the right elevator servo into channel 2, and the second
elevator servo into channel 5. If you need retracts, you will
have to use the output from channel 6.
2. Call up the mixer screen by repeatedly pressing the Edit Up
or Down key until the AILV window appears. The default is
for the function to be inhibited. To activate, press the
CLEAR key. This will cause the AILV INH display to change
to AILV ON. AILV is not a switch able function, it is either
ON or OFF.
3. Move the stick to command aileron. In addition to the aileron
servo(s), both elevator servos should move. They may move
in opposite directions (as they should) or the same direction
(instructions for correcting this are below).
4. Move the stick to command elevator. Both elevator servos
should move. They may move in the same direction (as
they should) or opposite directions (to be corrected below).
5. Press the Cursor Right key to get to the travel setting
menus. The display shows a triangle over the number 1 and
under the number 2, indicating you are in the AIL->CH2
setting menu, programming the response of the CH2
elevator servo due to aileron (CH1) commands.
6. If the elevator servo plugged into CH2 goes the correct
direction with aileron stick, go to the next step. Otherwise,
press the Data +Increase or -Decrease keys to change the
sign of the percentage displayed. If it is (+), change it to (-),
or vice versa. Only change the sign of the number, you can
decrease its value later if you need to.
7. If the elevator servo plugged into CH5 goes the correct
direction with aileron stick, go to the next step. Otherwise,
press the Cursor Right key to get to the AIL->CH5 setting
menu, then press the Data +Increase or -Decrease keys to
change the sign of the percentage displayed. If it is (+),
change it to (-), or vice versa. Only change the sign of the
number, you can decrease its value later if you need to.
8. If the elevator servo plugged into CH2 goes the correct
direction with elevator stick, go to the next step. Otherwise,
press the Cursor Right key to get to the AIL->CH2 setting
menu, then press the Data +Increase or -Decrease keys to
change the sign of the percentage displayed. If it is (+),
change it to (-), or vice versa. Only change the sign of the
number, you can decrease its value later if you need to.
9. If the elevator servo plugged into CH5 goes the correct
direction with elevator stick, go to the next step. Otherwise,
press the Cursor Right key to get to the ELEV->CH5 setting
menu, then press the Data +Increase or -Decrease keys to
change the sign of the percentage displayed. If it is (+),
change it to (-), or vice versa.
Airplane Model Function Descriptions - Page 40
10. Once you have all the servos moving the correct directions,
you can go back and adjust each of the travels
independently, so that both elevator servos move up the
SAME amount when elevator control is given, and move
opposite the same amount for aileron command. You will
need to decrease the percentage shown for the one moving
further, or increase the percentage for the one moving less.
Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links

Thanks for the help,i am out of town and dont have my manual and yes the hitec site is down as i had tried that also.