Joystick Throttle Contol

Hi! I am new to unity and I have made a few simple projects.

I am trying to make a space dogfight game

But my question is this, I have the T Flight Hotas X joystick, it has a large stick with a throttle control next to it. I did a calibration on the controller and It says that the throttle uses the Z axis, but I cant find the z axis in the input menu.