I dont know how I can connect my flysky to my pc. Can anyone help me?? Thanks

Here are a couple of videos that shows how to connect the Flysky FS i6:

https://www.youtube.com/watch?v=jgV_YlA9pxo&t=7s
https://www.youtube.com/watch?v=4Jzfn2wlUww

There you can also see how the calibration should look when it's
working correctly.
If you need more help please get back to me with more information(your operating system, what cable/dongle you are using, what happens when you go through the calibrate controller procedure)

edit:   (2021-03-26) 

The internal input system has been completely reworked in the latest update of Freerider and Freerider Recharged.

You can try that to see if it works better with your controller.