I decided to get this stick calibration tutorial here since i had a problem with the calibration when i received my Turnigy 9x, the aileron channel travelled to the end points when i moved the stick like 2millimeters and had some headache with that for few hours. The tutorial ain't written by me and i dont know who wrote it first but it helped me so here it goes:
Push the right lower trim tab to the left (aileron on a mode 2 TX), and the left side trim tab up (Throttle trim on a mode 2 tx), and while holding them, turn the Tx on. You will get a screen that shows the version number of the firmware, with four zeroes (0000) at the top of the screen.
 Center both sticks in their range in all axis, and press the menu button until it beeps and release. The screen number will change to 0001.
 Move the right stick to the upper right corner, and press menu, and you should get a beep, and the number on the screen will change to 0002.
 Put the right stick in the lower left corner, and press menu, and get a beep, and the number will change to 0003.
 Release the right stick, and put the left stick in the upper right corner, and press menu, get the beep, and the number will change to 0004.
 Put the left stick in the lower left corner, and press menu again, get the beep and the number will change to 0005. Center both sticks, and press menu, get the beep. You are done calibrating the sticks. After calibrating press Exit and the mainscreen should appear. 
Some tutorials told me to shut down the tx after calibration but i noticed that it wont save the calibration without pressing Exit and going to mainscreen (the screen that comes when you normally switch on the tx).