Set up

Setting up your transmitter so it will serve you as a simulator joystick is quite straightforward.

Cable:

You need a cable to connect your transmitter to your computer. You can either create your own cable or buy one. The cable's transmitter-end varies according to the type of the transmitter. Some transmitters (e.g. JR, Spektrum) require a very cheap cable while other transmitters require a more elaborate one.
In the Cables section you will exact instructions how to create and what to buy.

Download software:

Download SmartPropoPlus installation package.
Everything is in the Download section.

Installation:

Follow the instructions carefully. In most cases you will be simulating within 5 minutes from now.

Simulator:

According to the simulator, select joystick vJoy Device as you joystick. In many cases you will have to make some final adjustments such as axis assignments, axis inversion and calibration.