How to use and and enable trust reverser on jet engines?

@OmniExplorationDivision
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If you're not interested in adjusting things then;
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On mobile and in play, you will need to bring up the break slider so throttle and break can be active at the same time.
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On PC its full throttle and space bar.

Like Zenithspeed said, you need an input for thrust reverse. It doesn't have to be brake. There is a tab called "Thrust Reverse Input" that allows you to set the thrust reverse input. The default thrust reverse option is brake.

you need to brake while the engine is still producing thrust, if you see negative kN as the thrust you're doing it right
you can also rebind the thrust reverse input to something else (you'll find it somewhat below the engine configuration bit, i think even below tinker panel)

If there is a way how do I enable it and use it?